222120199597721 has 2 divisors, whose sum is σ = 222120199597722. Its totient is φ = 222120199597720.

The previous prime is 222120199597693. The next prime is 222120199597741. The reversal of 222120199597721 is 127795991021222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209585845326400 + 12534354271321 = 14477080^2 + 3540389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222120199597721 is a prime.

It is not a weakly prime, because it can be changed into another prime (222120199597741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060099798860 + 111060099798861.

It is an arithmetic number, because the mean of its divisors is an integer number (111060099798861).

Almost surely, 2^{222120199597721} is an apocalyptic number.

It is an amenable number.

222120199597721 is a deficient number, since it is larger than the sum of its proper divisors (1).

222120199597721 is an equidigital number, since it uses as much as digits as its factorization.

222120199597721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5715360, while the sum is 59.

The spelling of 222120199597721 in words is "two hundred twenty-two trillion, one hundred twenty billion, one hundred ninety-nine million, five hundred ninety-seven thousand, seven hundred twenty-one".