321320451 has 16 divisors (see below), whose sum is σ = 454132224. Its totient is φ = 201389184.

The previous prime is 321320423. The next prime is 321320453. The reversal of 321320451 is 154023123.

It is not a de Polignac number, because 321320451 - 2⁶ = 321320387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321320453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51250 + ... + 57176.

It is an arithmetic number, because the mean of its divisors is an integer number (28383264).

Almost surely, 2^321320451 is an apocalyptic number.

321320451 is a deficient number, since it is larger than the sum of its proper divisors (132811773).

321320451 is a wasteful number, since it uses less digits than its factorization.

321320451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7010.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 321320451 is about 17925.4135517148. The cubic root of 321320451 is about 684.9298956796.

Adding to 321320451 its reverse (154023123), we get a palindrome (475343574).

The spelling of 321320451 in words is "three hundred twenty-one million, three hundred twenty thousand, four hundred fifty-one".