20311212231 has 24 divisors (see below), whose sum is σ = 29628144000. Its totient is φ = 13407608592.

The previous prime is 20311212199. The next prime is 20311212253. The reversal of 20311212231 is 13221211302.

It is not a de Polignac number, because 20311212231 - 2⁵ = 20311212199 is a prime.

It is a super-2 number, since 2×20311212231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311212331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 452710 + ... + 495548.

It is an arithmetic number, because the mean of its divisors is an integer number (1234506000).

Almost surely, 2^20311212231 is an apocalyptic number.

20311212231 is a deficient number, since it is larger than the sum of its proper divisors (9316931769).

20311212231 is a wasteful number, since it uses less digits than its factorization.

20311212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43363 (or 43360 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20311212231 its reverse (13221211302), we get a palindrome (33532423533).

The spelling of 20311212231 in words is "twenty billion, three hundred eleven million, two hundred twelve thousand, two hundred thirty-one".