21937067 has 2 divisors, whose sum is σ = 21937068. Its totient is φ = 21937066.

The previous prime is 21937063. The next prime is 21937081. The reversal of 21937067 is 76073912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21937067 - 2² = 21937063 is a prime.

It is not a weakly prime, because it can be changed into another prime (21937061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10968533 + 10968534.

It is an arithmetic number, because the mean of its divisors is an integer number (10968534).

Almost surely, 2^21937067 is an apocalyptic number.

21937067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21937067 is an equidigital number, since it uses as much as digits as its factorization.

21937067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 21937067 is about 4683.7022749103. The cubic root of 21937067 is about 279.9364949516.

The spelling of 21937067 in words is "twenty-one million, nine hundred thirty-seven thousand, sixty-seven".