21002212552 has 32 divisors (see below), whose sum is σ = 41662209600. Its totient is φ = 9897902784.

The previous prime is 21002212549. The next prime is 21002212591. The reversal of 21002212552 is 25521220012.

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, 320748 + ... + 380635.

It is an arithmetic number, because the mean of its divisors is an integer number (1301944050).

Almost surely, 2^21002212552 is an apocalyptic number.

It is an amenable number.

21002212552 is a deficient number, since it is larger than the sum of its proper divisors (20659997048).

21002212552 is a wasteful number, since it uses less digits than its factorization.

21002212552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701605 (or 701601 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 21002212552 its reverse (25521220012), we get a palindrome (46523432564).

The spelling of 21002212552 in words is "twenty-one billion, two million, two hundred twelve thousand, five hundred fifty-two".