221868572507 has 2 divisors, whose sum is σ = 221868572508. Its totient is φ = 221868572506.

The previous prime is 221868572417. The next prime is 221868572521. The reversal of 221868572507 is 705275868122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221868572507 is a prime.

It is not a weakly prime, because it can be changed into another prime (221868572207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110934286253 + 110934286254.

It is an arithmetic number, because the mean of its divisors is an integer number (110934286254).

Almost surely, 2^221868572507 is an apocalyptic number.

221868572507 is a deficient number, since it is larger than the sum of its proper divisors (1).

221868572507 is an equidigital number, since it uses as much as digits as its factorization.

221868572507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 221868572507 in words is "two hundred twenty-one billion, eight hundred sixty-eight million, five hundred seventy-two thousand, five hundred seven".