221075768218157 has 4 divisors (see below), whose sum is σ = 221786622778656. Its totient is φ = 220364913657660.

The previous prime is 221075768218111. The next prime is 221075768218163. The reversal of 221075768218157 is 751812867570122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221075768218157 - 2⁸ = 221075768217901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221075768218157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221075768218177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355427279783 + ... + 355427280404.

It is an arithmetic number, because the mean of its divisors is an integer number (55446655694664).

Almost surely, 2^{221075768218157} is an apocalyptic number.

It is an amenable number.

221075768218157 is a deficient number, since it is larger than the sum of its proper divisors (710854560499).

221075768218157 is an equidigital number, since it uses as much as digits as its factorization.

221075768218157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710854560498.

The product of its (nonzero) digits is 26342400, while the sum is 62.

The spelling of 221075768218157 in words is "two hundred twenty-one trillion, seventy-five billion, seven hundred sixty-eight million, two hundred eighteen thousand, one hundred fifty-seven".