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10111121231 = 31326165201
BaseRepresentation
bin10010110101010101…
…10111011101001111
3222002122212011210112
421122222313131033
5131201421334411
64351152230235
7505364053361
oct113252673517
928078764715
1010111121231
114319512042
121b6223b37b
13c51a25c93
146bcc0ad31
153e2a0cb8b
hex25aab774f

10111121231 has 4 divisors (see below), whose sum is σ = 10437286464. Its totient is φ = 9784956000.

The previous prime is 10111121227. The next prime is 10111121243. The reversal of 10111121231 is 13212111101.

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 10111121231 - 22 = 10111121227 is a prime.

It is a super-2 number, since 2×101111212312 (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 (10111121201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163082570 + ... + 163082631.

It is an arithmetic number, because the mean of its divisors is an integer number (2609321616).

Almost surely, 210111121231 is an apocalyptic number.

10111121231 is a deficient number, since it is larger than the sum of its proper divisors (326165233).

10111121231 is an equidigital number, since it uses as much as digits as its factorization.

10111121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326165232.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 10111121231 its reverse (13212111101), we get a palindrome (23323232332).

The spelling of 10111121231 in words is "ten billion, one hundred eleven million, one hundred twenty-one thousand, two hundred thirty-one".

Divisors: 1 31 326165201 10111121231