321268910781 has 32 divisors (see below), whose sum is σ = 544217325568. Its totient is φ = 163994051520.

The previous prime is 321268910777. The next prime is 321268910783. The reversal of 321268910781 is 187019862123.

It is not a de Polignac number, because 321268910781 - 2² = 321268910777 is a prime.

It is a super-2 number, since 2×321268910781² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 321268910781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321268910783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18972331 + ... + 18989256.

It is an arithmetic number, because the mean of its divisors is an integer number (17006791424).

Almost surely, 2^321268910781 is an apocalyptic number.

321268910781 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

321268910781 is a deficient number, since it is larger than the sum of its proper divisors (222948414787).

321268910781 is a wasteful number, since it uses less digits than its factorization.

321268910781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37961641.

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 321268910781 in words is "three hundred twenty-one billion, two hundred sixty-eight million, nine hundred ten thousand, seven hundred eighty-one".