21700008 has 64 divisors (see below), whose sum is σ = 65764800. Its totient is φ = 6575040.

The previous prime is 21700001. The next prime is 21700039. The reversal of 21700008 is 80000712.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21700001) 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, 2191 + ... + 6942.

It is an arithmetic number, because the mean of its divisors is an integer number (1027575).

Almost surely, 2^21700008 is an apocalyptic number.

It is an amenable number.

21700008 is an abundant number, since it is smaller than the sum of its proper divisors (44064792).

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

21700008 is a wasteful number, since it uses less digits than its factorization.

21700008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9159 (or 9149 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21700008 is about 4658.3267382183. The cubic root of 21700008 is about 278.9244795019.

The spelling of 21700008 in words is "twenty-one million, seven hundred thousand, eight".