21370893 has 16 divisors (see below), whose sum is σ = 28994112. Its totient is φ = 14000000.

The previous prime is 21370891. The next prime is 21370901. The reversal of 21370893 is 39807312.

It is a cyclic number.

It is not a de Polignac number, because 21370893 - 2¹ = 21370891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21370891) 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, 75913 + ... + 76193.

It is an arithmetic number, because the mean of its divisors is an integer number (1812132).

Almost surely, 2^21370893 is an apocalyptic number.

It is an amenable number.

21370893 is a deficient number, since it is larger than the sum of its proper divisors (7623219).

21370893 is a wasteful number, since it uses less digits than its factorization.

21370893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21370893 is about 4622.8663186383. The cubic root of 21370893 is about 277.5071794263.

The spelling of 21370893 in words is "twenty-one million, three hundred seventy thousand, eight hundred ninety-three".