21113023012 has 6 divisors (see below), whose sum is σ = 36947790278. Its totient is φ = 10556511504.

The previous prime is 21113022949. The next prime is 21113023039. The reversal of 21113023012 is 21032031112.

It can be written as a sum of positive squares in only one way, i.e., 19736316196 + 1376706816 = 140486^2 + 37104^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639127873 + ... + 2639127880.

Almost surely, 2^21113023012 is an apocalyptic number.

It is an amenable number.

21113023012 is a deficient number, since it is larger than the sum of its proper divisors (15834767266).

21113023012 is a wasteful number, since it uses less digits than its factorization.

21113023012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278255757 (or 5278255755 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21113023012 its reverse (21032031112), we get a palindrome (42145054124).

The spelling of 21113023012 in words is "twenty-one billion, one hundred thirteen million, twenty-three thousand, twelve".