321555276040 has 128 divisors (see below), whose sum is σ = 763572096000. Its totient is φ = 121700367360.

The previous prime is 321555276037. The next prime is 321555276041. The reversal of 321555276040 is 40672555123.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 321555275984 and 321555276002.

It is not an unprimeable number, because it can be changed into a prime (321555276041) 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, 19247611 + ... + 19264309.

It is an arithmetic number, because the mean of its divisors is an integer number (5965407000).

Almost surely, 2^321555276040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321555276040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (381786048000).

321555276040 is an abundant number, since it is smaller than the sum of its proper divisors (442016819960).

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

321555276040 is a wasteful number, since it uses less digits than its factorization.

321555276040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17087 (or 17083 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 40.

The spelling of 321555276040 in words is "three hundred twenty-one billion, five hundred fifty-five million, two hundred seventy-six thousand, forty".