21727652 has 24 divisors (see below), whose sum is σ = 39567360. Its totient is φ = 10428480.

The previous prime is 21727639. The next prime is 21727661. The reversal of 21727652 is 25672712.

It is a super-2 number, since 2×21727652² = 944181722866208, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 16349 + ... + 17627.

It is an arithmetic number, because the mean of its divisors is an integer number (1648640).

Almost surely, 2^21727652 is an apocalyptic number.

It is an amenable number.

21727652 is a deficient number, since it is larger than the sum of its proper divisors (17839708).

21727652 is a wasteful number, since it uses less digits than its factorization.

21727652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451 (or 1449 counting only the distinct ones).

The product of its digits is 11760, while the sum is 32.

The square root of 21727652 is about 4661.2929536771. The cubic root of 21727652 is about 279.0428714155.

The spelling of 21727652 in words is "twenty-one million, seven hundred twenty-seven thousand, six hundred fifty-two".