7130821842 has 12 divisors (see below), whose sum is σ = 15450114030. Its totient is φ = 2376940608.

The previous prime is 7130821829. The next prime is 7130821879. The reversal of 7130821842 is 2481280317.

It can be written as a sum of positive squares in only one way, i.e., 3775979601 + 3354842241 = 61449^2 + 57921^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7130821797 and 7130821806.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 198078367 + ... + 198078402.

Almost surely, 2^7130821842 is an apocalyptic number.

7130821842 is an abundant number, since it is smaller than the sum of its proper divisors (8319292188).

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

7130821842 is a wasteful number, since it uses less digits than its factorization.

7130821842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396156777 (or 396156774 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 7130821842 is about 84444.1936547446. The cubic root of 7130821842 is about 1924.7745250726.

The spelling of 7130821842 in words is "seven billion, one hundred thirty million, eight hundred twenty-one thousand, eight hundred forty-two".