21111232312 has 16 divisors (see below), whose sum is σ = 40948511400. Its totient is φ = 10191629280.

The previous prime is 21111232267. The next prime is 21111232319. The reversal of 21111232312 is 21323211112.

It is a self number, because there is not a number n which added to its sum of digits gives 21111232312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111232319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45498114 + ... + 45498577.

Almost surely, 2^21111232312 is an apocalyptic number.

It is an amenable number.

21111232312 is a deficient number, since it is larger than the sum of its proper divisors (19837279088).

21111232312 is a wasteful number, since it uses less digits than its factorization.

21111232312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90996726 (or 90996722 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 21111232312 its reverse (21323211112), we get a palindrome (42434443424).

The spelling of 21111232312 in words is "twenty-one billion, one hundred eleven million, two hundred thirty-two thousand, three hundred twelve".