21002212572 has 24 divisors (see below), whose sum is σ = 53460177792. Its totient is φ = 6364306800.

The previous prime is 21002212549. The next prime is 21002212591. The reversal of 21002212572 is 27521220012.

It is a congruent number.

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, 79553704 + ... + 79553967.

It is an arithmetic number, because the mean of its divisors is an integer number (2227507408).

Almost surely, 2^21002212572 is an apocalyptic number.

21002212572 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21002212572 is an abundant number, since it is smaller than the sum of its proper divisors (32457965220).

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

21002212572 is a wasteful number, since it uses less digits than its factorization.

21002212572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159107689 (or 159107687 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

Adding to 21002212572 its reverse (27521220012), we get a palindrome (48523432584).

The spelling of 21002212572 in words is "twenty-one billion, two million, two hundred twelve thousand, five hundred seventy-two".