2497427721 has 20 divisors (see below), whose sum is σ = 3950181972. Its totient is φ = 1567012608.

The previous prime is 2497427693. The next prime is 2497427741. The reversal of 2497427721 is 1277247942.

2497427721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1172103696 + 1325324025 = 34236^2 + 36405^2 .

It is not a de Polignac number, because 2497427721 - 2⁵ = 2497427689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2497427741) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 905460 + ... + 908213.

Almost surely, 2^2497427721 is an apocalyptic number.

It is an amenable number.

2497427721 is a deficient number, since it is larger than the sum of its proper divisors (1452754251).

2497427721 is a wasteful number, since it uses less digits than its factorization.

2497427721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813702 (or 1813693 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 2497427721 is about 49974.2705899746. The cubic root of 2497427721 is about 1356.7431659305.

The spelling of 2497427721 in words is "two billion, four hundred ninety-seven million, four hundred twenty-seven thousand, seven hundred twenty-one".