21727632 has 40 divisors (see below), whose sum is σ = 59433696. Its totient is φ = 6816256.

The previous prime is 21727619. The next prime is 21727637. The reversal of 21727632 is 23672712.

It is a self number, because there is not a number n which added to its sum of digits gives 21727632.

It is not an unprimeable number, because it can be changed into a prime (21727637) 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, 12498 + ... + 14129.

Almost surely, 2^21727632 is an apocalyptic number.

It is an amenable number.

21727632 is an abundant number, since it is smaller than the sum of its proper divisors (37706064).

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

21727632 is a wasteful number, since it uses less digits than its factorization.

21727632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26655 (or 26649 counting only the distinct ones).

The product of its digits is 7056, while the sum is 30.

The square root of 21727632 is about 4661.2908083491. The cubic root of 21727632 is about 279.0427857971.

The spelling of 21727632 in words is "twenty-one million, seven hundred twenty-seven thousand, six hundred thirty-two".