21627128 has 16 divisors (see below), whose sum is σ = 42936480. Its totient is φ = 10177408.

The previous prime is 21627113. The next prime is 21627139. The reversal of 21627128 is 82172612.

It is a self number, because there is not a number n which added to its sum of digits gives 21627128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79376 + ... + 79647.

It is an arithmetic number, because the mean of its divisors is an integer number (2683530).

Almost surely, 2^21627128 is an apocalyptic number.

It is an amenable number.

21627128 is a deficient number, since it is larger than the sum of its proper divisors (21309352).

21627128 is a wasteful number, since it uses less digits than its factorization.

21627128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159046 (or 159042 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 21627128 is about 4650.4976077835. The cubic root of 21627128 is about 278.6118710765.

The spelling of 21627128 in words is "twenty-one million, six hundred twenty-seven thousand, one hundred twenty-eight".