21911332 has 12 divisors (see below), whose sum is σ = 40363120. Its totient is φ = 10379016.

The previous prime is 21911321. The next prime is 21911333. The reversal of 21911332 is 23311912.

It is not an unprimeable number, because it can be changed into a prime (21911333) 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, 144078 + ... + 144229.

Almost surely, 2^21911332 is an apocalyptic number.

It is an amenable number.

21911332 is a deficient number, since it is larger than the sum of its proper divisors (18451788).

21911332 is a wasteful number, since it uses less digits than its factorization.

21911332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288330 (or 288328 counting only the distinct ones).

The product of its digits is 324, while the sum is 22.

The square root of 21911332 is about 4680.9541762337. The cubic root of 21911332 is about 279.8269849509.

The spelling of 21911332 in words is "twenty-one million, nine hundred eleven thousand, three hundred thirty-two".