21827572 has 24 divisors (see below), whose sum is σ = 41531616. Its totient is φ = 9977568.

The previous prime is 21827567. The next prime is 21827579. The reversal of 21827572 is 27572812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21827579) 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, 3603 + ... + 7525.

It is an arithmetic number, because the mean of its divisors is an integer number (1730484).

Almost surely, 2^21827572 is an apocalyptic number.

It is an amenable number.

21827572 is a deficient number, since it is larger than the sum of its proper divisors (19704044).

21827572 is a wasteful number, since it uses less digits than its factorization.

21827572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4047 (or 4045 counting only the distinct ones).

The product of its digits is 15680, while the sum is 34.

The square root of 21827572 is about 4671.9987157532. The cubic root of 21827572 is about 279.4699666804.

The spelling of 21827572 in words is "twenty-one million, eight hundred twenty-seven thousand, five hundred seventy-two".