221964607 has 2 divisors, whose sum is σ = 221964608. Its totient is φ = 221964606.

The previous prime is 221964601. The next prime is 221964623. The reversal of 221964607 is 706469122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221964607 - 2³ = 221964599 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221964601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110982303 + 110982304.

It is an arithmetic number, because the mean of its divisors is an integer number (110982304).

Almost surely, 2^221964607 is an apocalyptic number.

221964607 is a deficient number, since it is larger than the sum of its proper divisors (1).

221964607 is an equidigital number, since it uses as much as digits as its factorization.

221964607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 221964607 is about 14898.4766670959. The cubic root of 221964607 is about 605.4727148107.

The spelling of 221964607 in words is "two hundred twenty-one million, nine hundred sixty-four thousand, six hundred seven".