21700572 has 24 divisors (see below), whose sum is σ = 50736000. Its totient is φ = 7219056.

The previous prime is 21700561. The next prime is 21700573. The reversal of 21700572 is 27500712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700573) 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, 5679 + ... + 8697.

It is an arithmetic number, because the mean of its divisors is an integer number (2114000).

Almost surely, 2^21700572 is an apocalyptic number.

It is an amenable number.

21700572 is an abundant number, since it is smaller than the sum of its proper divisors (29035428).

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

21700572 is a wasteful number, since it uses less digits than its factorization.

21700572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625 (or 3623 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 21700572 is about 4658.3872745833. The cubic root of 21700572 is about 278.9268959687.

The spelling of 21700572 in words is "twenty-one million, seven hundred thousand, five hundred seventy-two".