21955332 has 36 divisors (see below), whose sum is σ = 59594640. Its totient is φ = 6272784.

The previous prime is 21955309. The next prime is 21955333. The reversal of 21955332 is 23355912.

It is a self number, because there is not a number n which added to its sum of digits gives 21955332.

It is not an unprimeable number, because it can be changed into a prime (21955333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18082 + ... + 19257.

Almost surely, 2^21955332 is an apocalyptic number.

It is an amenable number.

21955332 is an abundant number, since it is smaller than the sum of its proper divisors (37639308).

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

21955332 is a wasteful number, since it uses less digits than its factorization.

21955332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37360 (or 37351 counting only the distinct ones).

The product of its digits is 8100, while the sum is 30.

The square root of 21955332 is about 4685.6517156101. The cubic root of 21955332 is about 280.0141659500.

The spelling of 21955332 in words is "twenty-one million, nine hundred fifty-five thousand, three hundred thirty-two".