21199512 has 32 divisors (see below), whose sum is σ = 53121600. Its totient is φ = 7050144.

The previous prime is 21199499. The next prime is 21199531. The reversal of 21199512 is 21599112.

It is a self number, because there is not a number n which added to its sum of digits gives 21199512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14143 + ... + 15569.

It is an arithmetic number, because the mean of its divisors is an integer number (1660050).

Almost surely, 2^21199512 is an apocalyptic number.

It is an amenable number.

21199512 is an abundant number, since it is smaller than the sum of its proper divisors (31922088).

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

21199512 is a wasteful number, since it uses less digits than its factorization.

21199512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2055 (or 2051 counting only the distinct ones).

The product of its digits is 1620, while the sum is 30.

The square root of 21199512 is about 4604.2927795700. The cubic root of 21199512 is about 276.7633771031.

The spelling of 21199512 in words is "twenty-one million, one hundred ninety-nine thousand, five hundred twelve".