21023122312 has 16 divisors (see below), whose sum is σ = 39490425360. Its totient is φ = 10492342224.

The previous prime is 21023122291. The next prime is 21023122319. The reversal of 21023122312 is 21322132012.

It is a self number, because there is not a number n which added to its sum of digits gives 21023122312.

It is not an unprimeable number, because it can be changed into a prime (21023122319) 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, 2397718 + ... + 2406469.

It is an arithmetic number, because the mean of its divisors is an integer number (2468151585).

Almost surely, 2^21023122312 is an apocalyptic number.

It is an amenable number.

21023122312 is a deficient number, since it is larger than the sum of its proper divisors (18467303048).

21023122312 is a wasteful number, since it uses less digits than its factorization.

21023122312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4804740 (or 4804736 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21023122312 its reverse (21322132012), we get a palindrome (42345254324).

The spelling of 21023122312 in words is "twenty-one billion, twenty-three million, one hundred twenty-two thousand, three hundred twelve".