7354521721 has 2 divisors, whose sum is σ = 7354521722. Its totient is φ = 7354521720.

The previous prime is 7354521701. The next prime is 7354521737. The reversal of 7354521721 is 1271254537.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4695675625 + 2658846096 = 68525^2 + 51564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7354521721 is a prime.

It is not a weakly prime, because it can be changed into another prime (7354521701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3677260860 + 3677260861.

It is an arithmetic number, because the mean of its divisors is an integer number (3677260861).

Almost surely, 2^7354521721 is an apocalyptic number.

It is an amenable number.

7354521721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7354521721 is an equidigital number, since it uses as much as digits as its factorization.

7354521721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 37.

The square root of 7354521721 is about 85758.5081551679. The cubic root of 7354521721 is about 1944.6949137194.

It can be divided in two parts, 73545 and 21721, that added together give a triangular number (95266 = T₄₃₆).

The spelling of 7354521721 in words is "seven billion, three hundred fifty-four million, five hundred twenty-one thousand, seven hundred twenty-one".