21372267 has 16 divisors (see below), whose sum is σ = 33984000. Its totient is φ = 11681472.

The previous prime is 21372233. The next prime is 21372269. The reversal of 21372267 is 76227312.

It is not a de Polignac number, because 21372267 - 2⁸ = 21372011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21372269) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 21642 + ... + 22607.

It is an arithmetic number, because the mean of its divisors is an integer number (2124000).

Almost surely, 2^21372267 is an apocalyptic number.

21372267 is a deficient number, since it is larger than the sum of its proper divisors (12611733).

21372267 is a wasteful number, since it uses less digits than its factorization.

21372267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44282.

The product of its digits is 7056, while the sum is 30.

The square root of 21372267 is about 4623.0149253490. The cubic root of 21372267 is about 277.5131265603.

Adding to 21372267 its reverse (76227312), we get a palindrome (97599579).

The spelling of 21372267 in words is "twenty-one million, three hundred seventy-two thousand, two hundred sixty-seven".