712215457721 has 2 divisors, whose sum is σ = 712215457722. Its totient is φ = 712215457720.

The previous prime is 712215457699. The next prime is 712215457727. The reversal of 712215457721 is 127754512217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 416128206400 + 296087251321 = 645080^2 + 544139^2 .

It is a cyclic number.

It is not a de Polignac number, because 712215457721 - 2¹⁰ = 712215456697 is a prime.

It is not a weakly prime, because it can be changed into another prime (712215457727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 356107728860 + 356107728861.

It is an arithmetic number, because the mean of its divisors is an integer number (356107728861).

Almost surely, 2^712215457721 is an apocalyptic number.

It is an amenable number.

712215457721 is a deficient number, since it is larger than the sum of its proper divisors (1).

712215457721 is an equidigital number, since it uses as much as digits as its factorization.

712215457721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 274400, while the sum is 44.

Adding to 712215457721 its reverse (127754512217), we get a palindrome (839969969938).

The spelling of 712215457721 in words is "seven hundred twelve billion, two hundred fifteen million, four hundred fifty-seven thousand, seven hundred twenty-one".