6821137452 has 24 divisors (see below), whose sum is σ = 16429407232. Its totient is φ = 2200366800.

The previous prime is 6821137423. The next prime is 6821137459. The reversal of 6821137452 is 2547311286.

It is a super-2 number, since 2×6821137452² = 93055832278154104608, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6821137452.

It is not an unprimeable number, because it can be changed into a prime (6821137459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9167824 + ... + 9168567.

Almost surely, 2^6821137452 is an apocalyptic number.

6821137452 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

6821137452 is an abundant number, since it is smaller than the sum of its proper divisors (9608269780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6821137452 is a wasteful number, since it uses less digits than its factorization.

6821137452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18336429 (or 18336427 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 6821137452 is about 82590.1776968666. The cubic root of 6821137452 is about 1896.4974671163.

The spelling of 6821137452 in words is "six billion, eight hundred twenty-one million, one hundred thirty-seven thousand, four hundred fifty-two".