321979209138 has 32 divisors (see below), whose sum is σ = 716246349120. Its totient is φ = 107215853760.

The previous prime is 321979209103. The next prime is 321979209197. The reversal of 321979209138 is 831902979123.

It is a super-2 number, since 2×321979209138² (a number of 24 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3017895 + ... + 3122762.

It is an arithmetic number, because the mean of its divisors is an integer number (22382698410).

Almost surely, 2^321979209138 is an apocalyptic number.

321979209138 is an abundant number, since it is smaller than the sum of its proper divisors (394267139982).

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

321979209138 is a wasteful number, since it uses less digits than its factorization.

321979209138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6141639 (or 6141633 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The spelling of 321979209138 in words is "three hundred twenty-one billion, nine hundred seventy-nine million, two hundred nine thousand, one hundred thirty-eight".