7342689721 has 2 divisors, whose sum is σ = 7342689722. Its totient is φ = 7342689720.

The previous prime is 7342689677. The next prime is 7342689733. The reversal of 7342689721 is 1279862437.

It is a happy number.

7342689721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4029075625 + 3313614096 = 63475^2 + 57564^2 .

It is a cyclic number.

It is not a de Polignac number, because 7342689721 - 2¹⁵ = 7342656953 is a prime.

It is not a weakly prime, because it can be changed into another prime (7342680721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3671344860 + 3671344861.

It is an arithmetic number, because the mean of its divisors is an integer number (3671344861).

Almost surely, 2^7342689721 is an apocalyptic number.

It is an amenable number.

7342689721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7342689721 is an equidigital number, since it uses as much as digits as its factorization.

7342689721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 49.

The square root of 7342689721 is about 85689.4959782119. The cubic root of 7342689721 is about 1943.6514748901.

The spelling of 7342689721 in words is "seven billion, three hundred forty-two million, six hundred eighty-nine thousand, seven hundred twenty-one".