21002232012 has 24 divisors (see below), whose sum is σ = 49153269312. Its totient is φ = 6979592400.

The previous prime is 21002231969. The next prime is 21002232091. The reversal of 21002232012 is 21023220012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21002231982 and 21002232000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2639814 + ... + 2647757.

It is an arithmetic number, because the mean of its divisors is an integer number (2048052888).

Almost surely, 2^21002232012 is an apocalyptic number.

It is an amenable number.

21002232012 is an abundant number, since it is smaller than the sum of its proper divisors (28151037300).

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

21002232012 is a wasteful number, since it uses less digits than its factorization.

21002232012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5287909 (or 5287907 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21002232012 its reverse (21023220012), we get a palindrome (42025452024).

The spelling of 21002232012 in words is "twenty-one billion, two million, two hundred thirty-two thousand, twelve".