321621135312 has 40 divisors (see below), whose sum is σ = 831183184800. Its totient is φ = 107164647040.

The previous prime is 321621135307. The next prime is 321621135317. The reversal of 321621135312 is 213531126123.

It is an interprime number because it is at equal distance from previous prime (321621135307) and next prime (321621135317).

It is a self number, because there is not a number n which added to its sum of digits gives 321621135312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321621135317) 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, 1202187 + ... + 1445162.

It is an arithmetic number, because the mean of its divisors is an integer number (20779579620).

Almost surely, 2^321621135312 is an apocalyptic number.

It is an amenable number.

321621135312 is an abundant number, since it is smaller than the sum of its proper divisors (509562049488).

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

321621135312 is a wasteful number, since it uses less digits than its factorization.

321621135312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649891 (or 2649885 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

It can be divided in two parts, 3216211 and 35312, that added together give a palindrome (3251523).

The spelling of 321621135312 in words is "three hundred twenty-one billion, six hundred twenty-one million, one hundred thirty-five thousand, three hundred twelve".