21374885 has 16 divisors (see below), whose sum is σ = 30326400. Its totient is φ = 14150976.

The previous prime is 21374851. The next prime is 21374887. The reversal of 21374885 is 58847312.

It is not a de Polignac number, because 21374885 - 2¹⁴ = 21358501 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21374887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9515 + ... + 11544.

It is an arithmetic number, because the mean of its divisors is an integer number (1895400).

Almost surely, 2^21374885 is an apocalyptic number.

It is an amenable number.

21374885 is a deficient number, since it is larger than the sum of its proper divisors (8951515).

21374885 is a wasteful number, since it uses less digits than its factorization.

21374885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21100.

The product of its digits is 53760, while the sum is 38.

The square root of 21374885 is about 4623.2980652344. The cubic root of 21374885 is about 277.5244574391.

The spelling of 21374885 in words is "twenty-one million, three hundred seventy-four thousand, eight hundred eighty-five".