21572893 has 8 divisors (see below), whose sum is σ = 21934080. Its totient is φ = 21214800.

The previous prime is 21572891. The next prime is 21572909. The reversal of 21572893 is 39827512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21572893 - 2¹ = 21572891 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21572891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16228 + ... + 17506.

It is an arithmetic number, because the mean of its divisors is an integer number (2741760).

Almost surely, 2^21572893 is an apocalyptic number.

It is an amenable number.

21572893 is a deficient number, since it is larger than the sum of its proper divisors (361187).

21572893 is a wasteful number, since it uses less digits than its factorization.

21572893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547.

The product of its digits is 30240, while the sum is 37.

The square root of 21572893 is about 4644.6628510582. The cubic root of 21572893 is about 278.3787816669.

It can be divided in two parts, 2157 and 2893, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 21572893 in words is "twenty-one million, five hundred seventy-two thousand, eight hundred ninety-three".