321856073972 has 12 divisors (see below), whose sum is σ = 563252284896. Its totient is φ = 160926849720.

The previous prime is 321856073921. The next prime is 321856073977. The reversal of 321856073972 is 279370658123.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321856073977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645623 + ... + 1029825.

It is an arithmetic number, because the mean of its divisors is an integer number (46937690408).

Almost surely, 2^321856073972 is an apocalyptic number.

It is an amenable number.

321856073972 is a deficient number, since it is larger than the sum of its proper divisors (241396210924).

321856073972 is a wasteful number, since it uses less digits than its factorization.

321856073972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593638 (or 593636 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 53.

The spelling of 321856073972 in words is "three hundred twenty-one billion, eight hundred fifty-six million, seventy-three thousand, nine hundred seventy-two".