21964067 has 2 divisors, whose sum is σ = 21964068. Its totient is φ = 21964066.

The previous prime is 21964037. The next prime is 21964073. The reversal of 21964067 is 76046912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21964067 - 2⁶ = 21964003 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21964037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10982033 + 10982034.

It is an arithmetic number, because the mean of its divisors is an integer number (10982034).

Almost surely, 2^21964067 is an apocalyptic number.

21964067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21964067 is an equidigital number, since it uses as much as digits as its factorization.

21964067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 21964067 is about 4686.5837237800. The cubic root of 21964067 is about 280.0512958742.

The spelling of 21964067 in words is "twenty-one million, nine hundred sixty-four thousand, sixty-seven".