21629884 has 12 divisors (see below), whose sum is σ = 38332000. Its totient is φ = 10677888.

The previous prime is 21629863. The next prime is 21629887. The reversal of 21629884 is 48892612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21629887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33909 + ... + 34540.

Almost surely, 2^21629884 is an apocalyptic number.

It is an amenable number.

21629884 is a deficient number, since it is larger than the sum of its proper divisors (16702116).

21629884 is a wasteful number, since it uses less digits than its factorization.

21629884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68532 (or 68530 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 21629884 is about 4650.7939107211. The cubic root of 21629884 is about 278.6237053139.

The spelling of 21629884 in words is "twenty-one million, six hundred twenty-nine thousand, eight hundred eighty-four".