21070488 has 16 divisors (see below), whose sum is σ = 52676280. Its totient is φ = 7023488.

The previous prime is 21070481. The next prime is 21070513. The reversal of 21070488 is 88407012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438945 + ... + 438992.

Almost surely, 2^21070488 is an apocalyptic number.

It is an amenable number.

21070488 is an abundant number, since it is smaller than the sum of its proper divisors (31605792).

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

21070488 is a wasteful number, since it uses less digits than its factorization.

21070488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877946 (or 877942 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 21070488 is about 4590.2601233481. The cubic root of 21070488 is about 276.2007571093.

The spelling of 21070488 in words is "twenty-one million, seventy thousand, four hundred eighty-eight".