21911152 has 20 divisors (see below), whose sum is σ = 42832080. Its totient is φ = 10857728.

The previous prime is 21911143. The next prime is 21911159. The reversal of 21911152 is 25111912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21911159) 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, 4252 + ... + 7867.

It is an arithmetic number, because the mean of its divisors is an integer number (2141604).

Almost surely, 2^21911152 is an apocalyptic number.

It is an amenable number.

21911152 is a deficient number, since it is larger than the sum of its proper divisors (20920928).

21911152 is a wasteful number, since it uses less digits than its factorization.

21911152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12240 (or 12234 counting only the distinct ones).

The product of its digits is 180, while the sum is 22.

The square root of 21911152 is about 4680.9349493451. The cubic root of 21911152 is about 279.8262186960.

The spelling of 21911152 in words is "twenty-one million, nine hundred eleven thousand, one hundred fifty-two".