21911352 has 16 divisors (see below), whose sum is σ = 54778440. Its totient is φ = 7303776.

The previous prime is 21911347. The next prime is 21911377. The reversal of 21911352 is 25311912.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 912973 = 21911352 / (2 + 1 + 9 + 1 + 1 + 3 + 5 + 2).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456463 + ... + 456510.

Almost surely, 2^21911352 is an apocalyptic number.

It is an amenable number.

21911352 is an abundant number, since it is smaller than the sum of its proper divisors (32867088).

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

21911352 is a wasteful number, since it uses less digits than its factorization.

21911352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912982 (or 912978 counting only the distinct ones).

The product of its digits is 540, while the sum is 24.

The square root of 21911352 is about 4680.9563125498. The cubic root of 21911352 is about 279.8270700900.

The spelling of 21911352 in words is "twenty-one million, nine hundred eleven thousand, three hundred fifty-two".