21490172552 has 32 divisors (see below), whose sum is σ = 40395801600. Its totient is φ = 10717999104.

The previous prime is 21490172537. The next prime is 21490172593. The reversal of 21490172552 is 25527109412.

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, 6784073 + ... + 6787239.

It is an arithmetic number, because the mean of its divisors is an integer number (1262368800).

Almost surely, 2^21490172552 is an apocalyptic number.

It is an amenable number.

21490172552 is a deficient number, since it is larger than the sum of its proper divisors (18905629048).

21490172552 is a wasteful number, since it uses less digits than its factorization.

21490172552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5045 (or 5041 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 21490172552 in words is "twenty-one billion, four hundred ninety million, one hundred seventy-two thousand, five hundred fifty-two".