21727634 has 8 divisors (see below), whose sum is σ = 32896368. Its totient is φ = 10762180.

The previous prime is 21727619. The next prime is 21727637. The reversal of 21727634 is 43672712.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21727634.

It is not an unprimeable number, because it can be changed into a prime (21727637) by changing a digit.

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, 50552 + ... + 50979.

It is an arithmetic number, because the mean of its divisors is an integer number (4112046).

Almost surely, 2^21727634 is an apocalyptic number.

21727634 is a deficient number, since it is larger than the sum of its proper divisors (11168734).

21727634 is a wasteful number, since it uses less digits than its factorization.

21727634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101640.

The product of its digits is 14112, while the sum is 32.

The square root of 21727634 is about 4661.2910228820. The cubic root of 21727634 is about 279.0427943589.

The spelling of 21727634 in words is "twenty-one million, seven hundred twenty-seven thousand, six hundred thirty-four".