21033020012 has 6 divisors (see below), whose sum is σ = 36807785028. Its totient is φ = 10516510004.

The previous prime is 21033020009. The next prime is 21033020051. The reversal of 21033020012 is 21002033012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629127498 + ... + 2629127505.

It is an arithmetic number, because the mean of its divisors is an integer number (6134630838).

Almost surely, 2^21033020012 is an apocalyptic number.

It is an amenable number.

21033020012 is a deficient number, since it is larger than the sum of its proper divisors (15774765016).

21033020012 is a wasteful number, since it uses less digits than its factorization.

21033020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5258255007 (or 5258255005 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21033020012 its reverse (21002033012), we get a palindrome (42035053024).

The spelling of 21033020012 in words is "twenty-one billion, thirty-three million, twenty thousand, twelve".