21084402 has 16 divisors (see below), whose sum is σ = 43529472. Its totient is φ = 6801360.

The previous prime is 21084397. The next prime is 21084419. The reversal of 21084402 is 20448012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56493 + ... + 56864.

It is an arithmetic number, because the mean of its divisors is an integer number (2720592).

Almost surely, 2^21084402 is an apocalyptic number.

21084402 is an abundant number, since it is smaller than the sum of its proper divisors (22445070).

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

21084402 is a wasteful number, since it uses less digits than its factorization.

21084402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113393.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 21084402 is about 4591.7754736050. The cubic root of 21084402 is about 276.2615405729.

The spelling of 21084402 in words is "twenty-one million, eighty-four thousand, four hundred two".