21070008 has 48 divisors (see below), whose sum is σ = 59038200. Its totient is φ = 6780480.

The previous prime is 21069977. The next prime is 21070009. The reversal of 21070008 is 80007012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2958 + ... + 7133.

Almost surely, 2^21070008 is an apocalyptic number.

It is an amenable number.

21070008 is an abundant number, since it is smaller than the sum of its proper divisors (37968192).

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

21070008 is a wasteful number, since it uses less digits than its factorization.

21070008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10132 (or 10125 counting only the distinct ones).

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

The square root of 21070008 is about 4590.2078384317. The cubic root of 21070008 is about 276.1986597466.

The spelling of 21070008 in words is "twenty-one million, seventy thousand, eight".