21417424008 has 16 divisors (see below), whose sum is σ = 53543560080. Its totient is φ = 7139141328.

The previous prime is 21417423991. The next prime is 21417424081. The reversal of 21417424008 is 80042471412.

It is a super-2 number, since 2×21417424008² (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 21417424008.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446196310 + ... + 446196357.

It is an arithmetic number, because the mean of its divisors is an integer number (3346472505).

Almost surely, 2^21417424008 is an apocalyptic number.

It is an amenable number.

21417424008 is an abundant number, since it is smaller than the sum of its proper divisors (32126136072).

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

21417424008 is a wasteful number, since it uses less digits than its factorization.

21417424008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892392676 (or 892392672 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The spelling of 21417424008 in words is "twenty-one billion, four hundred seventeen million, four hundred twenty-four thousand, eight".