21385002 has 16 divisors (see below), whose sum is σ = 42823872. Its totient is φ = 7119360.

The previous prime is 21384991. The next prime is 21385057. The reversal of 21385002 is 20058312.

It is a self number, because there is not a number n which added to its sum of digits gives 21385002.

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, 4458 + ... + 7914.

It is an arithmetic number, because the mean of its divisors is an integer number (2676492).

Almost surely, 2^21385002 is an apocalyptic number.

21385002 is an abundant number, since it is smaller than the sum of its proper divisors (21438870).

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

21385002 is a wasteful number, since it uses less digits than its factorization.

21385002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21385002 is about 4624.3920681534. The cubic root of 21385002 is about 277.5682357967.

It can be divided in two parts, 2138 and 5002, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 21385002 in words is "twenty-one million, three hundred eighty-five thousand, two".