227251720721 has 2 divisors, whose sum is σ = 227251720722. Its totient is φ = 227251720720.

The previous prime is 227251720681. The next prime is 227251720727. The reversal of 227251720721 is 127027152722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140052583696 + 87199137025 = 374236^2 + 295295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-227251720721 is a prime.

It is not a weakly prime, because it can be changed into another prime (227251720727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 113625860360 + 113625860361.

It is an arithmetic number, because the mean of its divisors is an integer number (113625860361).

Almost surely, 2^227251720721 is an apocalyptic number.

It is an amenable number.

227251720721 is a deficient number, since it is larger than the sum of its proper divisors (1).

227251720721 is an equidigital number, since it uses as much as digits as its factorization.

227251720721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54880, while the sum is 38.

The spelling of 227251720721 in words is "two hundred twenty-seven billion, two hundred fifty-one million, seven hundred twenty thousand, seven hundred twenty-one".