21792267 has 16 divisors (see below), whose sum is σ = 36897280. Its totient is φ = 12452616.

The previous prime is 21792263. The next prime is 21792289. The reversal of 21792267 is 76229712.

It is not a de Polignac number, because 21792267 - 2² = 21792263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21792263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57463 + ... + 57840.

It is an arithmetic number, because the mean of its divisors is an integer number (2306080).

Almost surely, 2^21792267 is an apocalyptic number.

21792267 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21792267 is a deficient number, since it is larger than the sum of its proper divisors (15105013).

21792267 is a wasteful number, since it uses less digits than its factorization.

21792267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115319 (or 115313 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 21792267 is about 4668.2188252052. The cubic root of 21792267 is about 279.3192091648.

The spelling of 21792267 in words is "twenty-one million, seven hundred ninety-two thousand, two hundred sixty-seven".