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12222311231 = 13940177787
BaseRepresentation
bin10110110001000000…
…11010101100111111
31011112210102202000202
423120200122230333
5200012402424411
65340450314115
7611610634304
oct133040325477
934483382022
1012222311231
1152021a3369
12245128893b
1311ca231230
1483d36b0ab
154b803583b
hex2d881ab3f

12222311231 has 4 divisors (see below), whose sum is σ = 13162489032. Its totient is φ = 11282133432.

The previous prime is 12222311209. The next prime is 12222311243. The reversal of 12222311231 is 13211322221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13211322221 = 61332154137.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-12222311231 is a prime.

It is a super-2 number, since 2×122223112312 (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 (12222311531) 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, 470088881 + ... + 470088906.

It is an arithmetic number, because the mean of its divisors is an integer number (3290622258).

Almost surely, 212222311231 is an apocalyptic number.

12222311231 is a deficient number, since it is larger than the sum of its proper divisors (940177801).

12222311231 is an equidigital number, since it uses as much as digits as its factorization.

12222311231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940177800.

The product of its digits is 288, while the sum is 20.

Adding to 12222311231 its reverse (13211322221), we get a palindrome (25433633452).

The spelling of 12222311231 in words is "twelve billion, two hundred twenty-two million, three hundred eleven thousand, two hundred thirty-one".

Divisors: 1 13 940177787 12222311231