21612021612 has 48 divisors (see below), whose sum is σ = 50960761824. Its totient is φ = 7128000000.

The previous prime is 21612021593. The next prime is 21612021623.

21612021612 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2177862 + ... + 2187762.

It is an arithmetic number, because the mean of its divisors is an integer number (1061682538).

Almost surely, 2^21612021612 is an apocalyptic number.

It is an amenable number.

21612021612 is an abundant number, since it is smaller than the sum of its proper divisors (29348740212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21612021612 is a wasteful number, since it uses less digits than its factorization.

21612021612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11810 (or 11808 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

It can be divided in two parts, 216120 and 21612, that added together give a palindrome (237732).

The spelling of 21612021612 in words is "twenty-one billion, six hundred twelve million, twenty-one thousand, six hundred twelve".