2621398813 has 12 divisors (see below), whose sum is σ = 2892119580. Its totient is φ = 2374201280.

The previous prime is 2621398789. The next prime is 2621398817. The reversal of 2621398813 is 3188931262.

It can be written as a sum of positive squares in 2 ways, for example, as 589372729 + 2032026084 = 24277^2 + 45078^2 .

It is not a de Polignac number, because 2621398813 - 2⁹ = 2621398301 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 2621398813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621398817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7720 + ... + 72817.

It is an arithmetic number, because the mean of its divisors is an integer number (241009965).

Almost surely, 2^2621398813 is an apocalyptic number.

It is an amenable number.

2621398813 is a deficient number, since it is larger than the sum of its proper divisors (270720767).

2621398813 is a wasteful number, since it uses less digits than its factorization.

2621398813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80828 (or 80817 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 2621398813 is about 51199.5977816232. The cubic root of 2621398813 is about 1378.8309803341.

The spelling of 2621398813 in words is "two billion, six hundred twenty-one million, three hundred ninety-eight thousand, eight hundred thirteen".