21073884 has 24 divisors (see below), whose sum is σ = 52955280. Its totient is φ = 6484224.

The previous prime is 21073879. The next prime is 21073889. The reversal of 21073884 is 48837012.

It is an interprime number because it is at equal distance from previous prime (21073879) and next prime (21073889).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21073889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67389 + ... + 67700.

It is an arithmetic number, because the mean of its divisors is an integer number (2206470).

Almost surely, 2^21073884 is an apocalyptic number.

It is an amenable number.

21073884 is an abundant number, since it is smaller than the sum of its proper divisors (31881396).

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

21073884 is a wasteful number, since it uses less digits than its factorization.

21073884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135109 (or 135107 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 21073884 is about 4590.6300221211. The cubic root of 21073884 is about 276.2155950410.

The spelling of 21073884 in words is "twenty-one million, seventy-three thousand, eight hundred eighty-four".