21949152 has 24 divisors (see below), whose sum is σ = 57616776. Its totient is φ = 7316352.

The previous prime is 21949139. The next prime is 21949163. The reversal of 21949152 is 25194912.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

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, 114223 + ... + 114414.

It is an arithmetic number, because the mean of its divisors is an integer number (2400699).

Almost surely, 2^21949152 is an apocalyptic number.

It is an amenable number.

21949152 is an abundant number, since it is smaller than the sum of its proper divisors (35667624).

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

21949152 is a wasteful number, since it uses less digits than its factorization.

21949152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228650 (or 228642 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 21949152 is about 4684.9922091718. The cubic root of 21949152 is about 279.9878906328.

The spelling of 21949152 in words is "twenty-one million, nine hundred forty-nine thousand, one hundred fifty-two".