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12101231231 = 42412853391
BaseRepresentation
bin10110100010100101…
…00010001001111111
31011020100121020111022
423101102202021333
5144240403344411
65320443214355
7605610524345
oct132122421177
934210536438
1012101231231
11514a914151
1224188173bb
1311ab11986b
1482b24d995
154ac5b9edb
hex2d14a227f

12101231231 has 4 divisors (see below), whose sum is σ = 12104088864. Its totient is φ = 12098373600.

The previous prime is 12101231213. The next prime is 12101231237. The reversal of 12101231231 is 13213210121.

Adding to 12101231231 its reverse (13213210121), we get a palindrome (25314441352).

12101231231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12101231231 - 214 = 12101214847 is a prime.

It is a super-2 number, since 2×121012312312 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101231237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1422455 + ... + 1430936.

It is an arithmetic number, because the mean of its divisors is an integer number (3026022216).

Almost surely, 212101231231 is an apocalyptic number.

12101231231 is a deficient number, since it is larger than the sum of its proper divisors (2857633).

12101231231 is an equidigital number, since it uses as much as digits as its factorization.

12101231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857632.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 12101231231 in words is "twelve billion, one hundred one million, two hundred thirty-one thousand, two hundred thirty-one".

Divisors: 1 4241 2853391 12101231231