21338070 has 32 divisors (see below), whose sum is σ = 55151712. Its totient is φ = 5252352.

The previous prime is 21338063. The next prime is 21338099. The reversal of 21338070 is 7083312.

It is a self number, because there is not a number n which added to its sum of digits gives 21338070.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26967 + ... + 27746.

It is an arithmetic number, because the mean of its divisors is an integer number (1723491).

Almost surely, 2^21338070 is an apocalyptic number.

21338070 is an abundant number, since it is smaller than the sum of its proper divisors (33813642).

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

21338070 is a wasteful number, since it uses less digits than its factorization.

21338070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54736.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21338070 is about 4619.3148842658. The cubic root of 21338070 is about 277.3650346040.

It can be divided in two parts, 213 and 38070, that added together give a palindrome (38283).

The spelling of 21338070 in words is "twenty-one million, three hundred thirty-eight thousand, seventy".