221222087 has 2 divisors, whose sum is σ = 221222088. Its totient is φ = 221222086.

The previous prime is 221222077. The next prime is 221222123. The reversal of 221222087 is 780222122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221222087 - 2¹⁸ = 220959943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221222077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611043 + 110611044.

It is an arithmetic number, because the mean of its divisors is an integer number (110611044).

Almost surely, 2^221222087 is an apocalyptic number.

221222087 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222087 is an equidigital number, since it uses as much as digits as its factorization.

221222087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 221222087 is about 14873.5364658174. The cubic root of 221222087 is about 604.7968144956.

The spelling of 221222087 in words is "two hundred twenty-one million, two hundred twenty-two thousand, eighty-seven".