67831621321 has 4 divisors (see below), whose sum is σ = 70780822272. Its totient is φ = 64882420372.

The previous prime is 67831621301. The next prime is 67831621337. The reversal of 67831621321 is 12312613876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67831621321 - 2⁹ = 67831620809 is a prime.

It is a super-2 number, since 2×67831621321² (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 (67831621301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1474600441 + ... + 1474600486.

It is an arithmetic number, because the mean of its divisors is an integer number (17695205568).

Almost surely, 2^67831621321 is an apocalyptic number.

It is an amenable number.

67831621321 is a deficient number, since it is larger than the sum of its proper divisors (2949200951).

67831621321 is a wasteful number, since it uses less digits than its factorization.

67831621321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949200950.

The product of its digits is 72576, while the sum is 40.

The spelling of 67831621321 in words is "sixty-seven billion, eight hundred thirty-one million, six hundred twenty-one thousand, three hundred twenty-one".