21002231012 has 24 divisors (see below), whose sum is σ = 42007581504. Its totient is φ = 9000287712.

The previous prime is 21002230943. The next prime is 21002231023. The reversal of 21002231012 is 21013220012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 621578 + ... + 654494.

It is an arithmetic number, because the mean of its divisors is an integer number (1750315896).

Almost surely, 2^21002231012 is an apocalyptic number.

It is an amenable number.

21002231012 is an abundant number, since it is smaller than the sum of its proper divisors (21005350492).

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

21002231012 is a wasteful number, since it uses less digits than its factorization.

21002231012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55715 (or 55713 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21002231012 its reverse (21013220012), we get a palindrome (42015451024).

The spelling of 21002231012 in words is "twenty-one billion, two million, two hundred thirty-one thousand, twelve".