221357207 has 2 divisors, whose sum is σ = 221357208. Its totient is φ = 221357206.

The previous prime is 221357179. The next prime is 221357209. The reversal of 221357207 is 702753122.

221357207 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221357207 is a prime.

Together with 221357209, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221357207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221357209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110678603 + 110678604.

It is an arithmetic number, because the mean of its divisors is an integer number (110678604).

Almost surely, 2^221357207 is an apocalyptic number.

221357207 is a deficient number, since it is larger than the sum of its proper divisors (1).

221357207 is an equidigital number, since it uses as much as digits as its factorization.

221357207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 221357207 is about 14878.0780680839. The cubic root of 221357207 is about 604.9199238325.

The spelling of 221357207 in words is "two hundred twenty-one million, three hundred fifty-seven thousand, two hundred seven".