321540051400 has 48 divisors (see below), whose sum is σ = 786926977200. Its totient is φ = 121846754880.

The previous prime is 321540051389. The next prime is 321540051403. The reversal of 321540051400 is 4150045123.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (321540051403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42304102 + ... + 42311701.

It is an arithmetic number, because the mean of its divisors is an integer number (16394312025).

Almost surely, 2^321540051400 is an apocalyptic number.

It is an amenable number.

321540051400 is an abundant number, since it is smaller than the sum of its proper divisors (465386925800).

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

321540051400 is a wasteful number, since it uses less digits than its factorization.

321540051400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84615838 (or 84615829 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 321540051400 its reverse (4150045123), we get a palindrome (325690096523).

The spelling of 321540051400 in words is "three hundred twenty-one billion, five hundred forty million, fifty-one thousand, four hundred".