21899512 has 8 divisors (see below), whose sum is σ = 41061600. Its totient is φ = 10949752.

The previous prime is 21899497. The next prime is 21899543. The reversal of 21899512 is 21599812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) 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 polite number, since it can be written as a sum of consecutive naturals, namely, 1368712 + ... + 1368727.

It is an arithmetic number, because the mean of its divisors is an integer number (5132700).

Almost surely, 2^21899512 is an apocalyptic number.

It is an amenable number.

21899512 is a deficient number, since it is larger than the sum of its proper divisors (19162088).

21899512 is a wasteful number, since it uses less digits than its factorization.

21899512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2737445 (or 2737441 counting only the distinct ones).

The product of its digits is 12960, while the sum is 37.

The square root of 21899512 is about 4679.6914428197. The cubic root of 21899512 is about 279.7766586343.

The spelling of 21899512 in words is "twenty-one million, eight hundred ninety-nine thousand, five hundred twelve".