7811421808842 has 20 divisors (see below), whose sum is σ = 17503371090546. Its totient is φ = 2603807269560.

The previous prime is 7811421808787. The next prime is 7811421808919. The reversal of 7811421808842 is 2488081241187.

It can be written as a sum of positive squares in only one way, i.e., 7738516948761 + 72904860081 = 2781819^2 + 270009^2 .

It is a super-2 number, since 2×7811421808842² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 24109326409 + ... + 24109326732.

Almost surely, 2^{7811421808842} is an apocalyptic number.

7811421808842 is an abundant number, since it is smaller than the sum of its proper divisors (9691949281704).

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

7811421808842 is a wasteful number, since it uses less digits than its factorization.

7811421808842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48218653155 (or 48218653146 counting only the distinct ones).

The product of its (nonzero) digits is 1835008, while the sum is 54.

The spelling of 7811421808842 in words is "seven trillion, eight hundred eleven billion, four hundred twenty-one million, eight hundred eight thousand, eight hundred forty-two".