7427144721 has 4 divisors (see below), whose sum is σ = 9902859632. Its totient is φ = 4951429812.

The previous prime is 7427144701. The next prime is 7427144729. The reversal of 7427144721 is 1274417247.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7427144721 - 2⁶ = 7427144657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7427144721.

It is not an unprimeable number, because it can be changed into a prime (7427144729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1237857451 + ... + 1237857456.

It is an arithmetic number, because the mean of its divisors is an integer number (2475714908).

Almost surely, 2^7427144721 is an apocalyptic number.

It is an amenable number.

7427144721 is a deficient number, since it is larger than the sum of its proper divisors (2475714911).

7427144721 is a wasteful number, since it uses less digits than its factorization.

7427144721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2475714910.

The product of its digits is 87808, while the sum is 39.

The square root of 7427144721 is about 86180.8837329950. The cubic root of 7427144721 is about 1951.0749909678.

The spelling of 7427144721 in words is "seven billion, four hundred twenty-seven million, one hundred forty-four thousand, seven hundred twenty-one".