67982121931 has 8 divisors (see below), whose sum is σ = 68991380480. Its totient is φ = 66976581672.

The previous prime is 67982121917. The next prime is 67982121941. The reversal of 67982121931 is 13912128976.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67982121931 - 2⁷ = 67982121803 is a prime.

It is a super-2 number, since 2×67982121931² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67982121901) 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, 892725 + ... + 965878.

It is an arithmetic number, because the mean of its divisors is an integer number (8623922560).

Almost surely, 2^67982121931 is an apocalyptic number.

67982121931 is a deficient number, since it is larger than the sum of its proper divisors (1009258549).

67982121931 is a wasteful number, since it uses less digits than its factorization.

67982121931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859145.

The product of its digits is 326592, while the sum is 49.

The spelling of 67982121931 in words is "sixty-seven billion, nine hundred eighty-two million, one hundred twenty-one thousand, nine hundred thirty-one".