321202139 has 2 divisors, whose sum is σ = 321202140. Its totient is φ = 321202138.

The previous prime is 321202111. The next prime is 321202151. The reversal of 321202139 is 931202123.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321202139 - 2¹² = 321198043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (321202169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160601069 + 160601070.

It is an arithmetic number, because the mean of its divisors is an integer number (160601070).

Almost surely, 2^321202139 is an apocalyptic number.

321202139 is a deficient number, since it is larger than the sum of its proper divisors (1).

321202139 is an equidigital number, since it uses as much as digits as its factorization.

321202139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 321202139 is about 17922.1131287580. The cubic root of 321202139 is about 684.8458203445.

The spelling of 321202139 in words is "three hundred twenty-one million, two hundred two thousand, one hundred thirty-nine".