221220032993 has 2 divisors, whose sum is σ = 221220032994. Its totient is φ = 221220032992.

The previous prime is 221220032939. The next prime is 221220033037. The reversal of 221220032993 is 399230022122.

Together with previous prime (221220032939) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190193676544 + 31026356449 = 436112^2 + 176143^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220032993 - 2¹⁴ = 221220016609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221220032393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610016496 + 110610016497.

It is an arithmetic number, because the mean of its divisors is an integer number (110610016497).

Almost surely, 2^221220032993 is an apocalyptic number.

It is an amenable number.

221220032993 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220032993 is an equidigital number, since it uses as much as digits as its factorization.

221220032993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The spelling of 221220032993 in words is "two hundred twenty-one billion, two hundred twenty million, thirty-two thousand, nine hundred ninety-three".