21650572 has 12 divisors (see below), whose sum is σ = 37996560. Its totient is φ = 10794416.

The previous prime is 21650569. The next prime is 21650599. The reversal of 21650572 is 27505612.

It is a self number, because there is not a number n which added to its sum of digits gives 21650572.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6103 + ... + 8974.

It is an arithmetic number, because the mean of its divisors is an integer number (3166380).

Almost surely, 2^21650572 is an apocalyptic number.

It is an amenable number.

21650572 is a deficient number, since it is larger than the sum of its proper divisors (16345988).

21650572 is a wasteful number, since it uses less digits than its factorization.

21650572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15440 (or 15438 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 21650572 is about 4653.0175155484. The cubic root of 21650572 is about 278.7125073076.

It can be divided in two parts, 21650 and 572, that added together give a palindrome (22222).

The spelling of 21650572 in words is "twenty-one million, six hundred fifty thousand, five hundred seventy-two".