21617362608 has 40 divisors (see below), whose sum is σ = 55878560448. Its totient is φ = 7201438272.

The previous prime is 21617362597. The next prime is 21617362633. The reversal of 21617362608 is 80626371612.

It is a super-2 number, since 2×21617362608² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21617362608.

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, 55066 + ... + 215097.

Almost surely, 2^21617362608 is an apocalyptic number.

It is an amenable number.

21617362608 is an abundant number, since it is smaller than the sum of its proper divisors (34261197840).

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

21617362608 is a wasteful number, since it uses less digits than its factorization.

21617362608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271841 (or 271835 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 21617362608 in words is "twenty-one billion, six hundred seventeen million, three hundred sixty-two thousand, six hundred eight".