21117357352 has 64 divisors (see below), whose sum is σ = 48761193600. Its totient is φ = 8349177600.

The previous prime is 21117357341. The next prime is 21117357353. The reversal of 21117357352 is 25375371112.

It is not an unprimeable number, because it can be changed into a prime (21117357353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1376299 + ... + 1391557.

It is an arithmetic number, because the mean of its divisors is an integer number (761893650).

Almost surely, 2^21117357352 is an apocalyptic number.

It is an amenable number.

21117357352 is an abundant number, since it is smaller than the sum of its proper divisors (27643836248).

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

21117357352 is a wasteful number, since it uses less digits than its factorization.

21117357352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17186 (or 17182 counting only the distinct ones).

The product of its digits is 44100, while the sum is 37.

The spelling of 21117357352 in words is "twenty-one billion, one hundred seventeen million, three hundred fifty-seven thousand, three hundred fifty-two".