321200051 has 2 divisors, whose sum is σ = 321200052. Its totient is φ = 321200050.

The previous prime is 321199993. The next prime is 321200063. The reversal of 321200051 is 150002123.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321200051 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 321199999 and 321200035.

It is not a weakly prime, because it can be changed into another prime (321200351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160600025 + 160600026.

It is an arithmetic number, because the mean of its divisors is an integer number (160600026).

Almost surely, 2^321200051 is an apocalyptic number.

321200051 is a deficient number, since it is larger than the sum of its proper divisors (1).

321200051 is an equidigital number, since it uses as much as digits as its factorization.

321200051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 321200051 is about 17922.0548766039. The cubic root of 321200051 is about 684.8443363765.

Adding to 321200051 its reverse (150002123), we get a palindrome (471202174).

The spelling of 321200051 in words is "three hundred twenty-one million, two hundred thousand, fifty-one".