21067992 has 64 divisors (see below), whose sum is σ = 63849600. Its totient is φ = 6383520.

The previous prime is 21067961. The next prime is 21067993. The reversal of 21067992 is 29976012.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21067993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2058 + ... + 6809.

It is an arithmetic number, because the mean of its divisors is an integer number (997650).

Almost surely, 2^21067992 is an apocalyptic number.

21067992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21067992 is an abundant number, since it is smaller than the sum of its proper divisors (42781608).

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

21067992 is a wasteful number, since it uses less digits than its factorization.

21067992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8893 (or 8883 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 21067992 is about 4589.9882352790. The cubic root of 21067992 is about 276.1898504752.

The spelling of 21067992 in words is "twenty-one million, sixty-seven thousand, nine hundred ninety-two".