21268967 has 2 divisors, whose sum is σ = 21268968. Its totient is φ = 21268966.

The previous prime is 21268943. The next prime is 21268991. The reversal of 21268967 is 76986212.

It is a balanced prime because it is at equal distance from previous prime (21268943) and next prime (21268991).

It is a cyclic number.

It is not a de Polignac number, because 21268967 - 2⁶ = 21268903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21268927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10634483 + 10634484.

It is an arithmetic number, because the mean of its divisors is an integer number (10634484).

Almost surely, 2^21268967 is an apocalyptic number.

21268967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21268967 is an equidigital number, since it uses as much as digits as its factorization.

21268967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 21268967 is about 4611.8290297885. The cubic root of 21268967 is about 277.0652967223.

The spelling of 21268967 in words is "twenty-one million, two hundred sixty-eight thousand, nine hundred sixty-seven".