21439002 has 24 divisors (see below), whose sum is σ = 46432224. Its totient is φ = 6596304.

The previous prime is 21438961. The next prime is 21439079. The reversal of 21439002 is 20093412.

It is a self number, because there is not a number n which added to its sum of digits gives 21439002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9558 + ... + 11585.

It is an arithmetic number, because the mean of its divisors is an integer number (1934676).

Almost surely, 2^21439002 is an apocalyptic number.

21439002 is an abundant number, since it is smaller than the sum of its proper divisors (24993222).

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

21439002 is a wasteful number, since it uses less digits than its factorization.

21439002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21174 (or 21161 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21439002 is about 4630.2269922759. The cubic root of 21439002 is about 277.8016717698.

The spelling of 21439002 in words is "twenty-one million, four hundred thirty-nine thousand, two".