7440124721 has 2 divisors, whose sum is σ = 7440124722. Its totient is φ = 7440124720.

The previous prime is 7440124711. The next prime is 7440124729. The reversal of 7440124721 is 1274210447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6907438321 + 532686400 = 83111^2 + 23080^2 .

It is an emirp because it is prime and its reverse (1274210447) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7440124721 - 2²² = 7435930417 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 (7440124729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3720062360 + 3720062361.

It is an arithmetic number, because the mean of its divisors is an integer number (3720062361).

Almost surely, 2^7440124721 is an apocalyptic number.

It is an amenable number.

7440124721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7440124721 is an equidigital number, since it uses as much as digits as its factorization.

7440124721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 7440124721 is about 86256.1575830966. The cubic root of 7440124721 is about 1952.2109238934.

The spelling of 7440124721 in words is "seven billion, four hundred forty million, one hundred twenty-four thousand, seven hundred twenty-one".