21616632 has 40 divisors (see below), whose sum is σ = 60548400. Its totient is φ = 7205328.

The previous prime is 21616607. The next prime is 21616643. The reversal of 21616632 is 23661612.

21616632 is a `hidden beast` number, since 2 + 16 + 16 + 632 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21616596 and 21616605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16032 + ... + 17327.

It is an arithmetic number, because the mean of its divisors is an integer number (1513710).

Almost surely, 2^21616632 is an apocalyptic number.

It is an amenable number.

21616632 is an abundant number, since it is smaller than the sum of its proper divisors (38931768).

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

21616632 is a wasteful number, since it uses less digits than its factorization.

21616632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33377 (or 33364 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21616632 is about 4649.3689894436. The cubic root of 21616632 is about 278.5667921460.

The spelling of 21616632 in words is "twenty-one million, six hundred sixteen thousand, six hundred thirty-two".