456213721 has 2 divisors, whose sum is σ = 456213722. Its totient is φ = 456213720.

The previous prime is 456213697. The next prime is 456213727. The reversal of 456213721 is 127312654.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389628121 + 66585600 = 19739^2 + 8160^2 .

It is a cyclic number.

It is not a de Polignac number, because 456213721 - 2⁹ = 456213209 is a prime.

It is not a weakly prime, because it can be changed into another prime (456213727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 228106860 + 228106861.

It is an arithmetic number, because the mean of its divisors is an integer number (228106861).

Almost surely, 2^456213721 is an apocalyptic number.

It is an amenable number.

456213721 is a deficient number, since it is larger than the sum of its proper divisors (1).

456213721 is an equidigital number, since it uses as much as digits as its factorization.

456213721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 456213721 is about 21359.1601192556. The cubic root of 456213721 is about 769.8204568174.

The spelling of 456213721 in words is "four hundred fifty-six million, two hundred thirteen thousand, seven hundred twenty-one".