21201022988 has 6 divisors (see below), whose sum is σ = 37101790236. Its totient is φ = 10600511492.

The previous prime is 21201022981. The next prime is 21201023047. The reversal of 21201022988 is 88922010212.

It is not an unprimeable number, because it can be changed into a prime (21201022981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650127870 + ... + 2650127877.

It is an arithmetic number, because the mean of its divisors is an integer number (6183631706).

Almost surely, 2^21201022988 is an apocalyptic number.

It is an amenable number.

21201022988 is a deficient number, since it is larger than the sum of its proper divisors (15900767248).

21201022988 is a wasteful number, since it uses less digits than its factorization.

21201022988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300255751 (or 5300255749 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The spelling of 21201022988 in words is "twenty-one billion, two hundred one million, twenty-two thousand, nine hundred eighty-eight".