21220020992 has 18 divisors (see below), whose sum is σ = 42357151788. Its totient is φ = 10610010368.

The previous prime is 21220020989. The next prime is 21220021001. The reversal of 21220020992 is 29902002212.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41445098 + ... + 41445609.

Almost surely, 2^21220020992 is an apocalyptic number.

It is an amenable number.

21220020992 is a deficient number, since it is larger than the sum of its proper divisors (21137130796).

21220020992 is an frugal number, since it uses more digits than its factorization.

21220020992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82890723 (or 82890709 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 21220020992 in words is "twenty-one billion, two hundred twenty million, twenty thousand, nine hundred ninety-two".