221075073991 has 2 divisors, whose sum is σ = 221075073992. Its totient is φ = 221075073990.

The previous prime is 221075073953. The next prime is 221075074063. The reversal of 221075073991 is 199370570122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221075073991 - 2²⁹ = 220538203079 is a prime.

It is a super-2 number, since 2×221075073991² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221075073091) 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, 110537536995 + 110537536996.

It is an arithmetic number, because the mean of its divisors is an integer number (110537536996).

Almost surely, 2^221075073991 is an apocalyptic number.

221075073991 is a deficient number, since it is larger than the sum of its proper divisors (1).

221075073991 is an equidigital number, since it uses as much as digits as its factorization.

221075073991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 46.

The spelling of 221075073991 in words is "two hundred twenty-one billion, seventy-five million, seventy-three thousand, nine hundred ninety-one".