321021949 has 2 divisors, whose sum is σ = 321021950. Its totient is φ = 321021948.

The previous prime is 321021947. The next prime is 321021959. The reversal of 321021949 is 949120123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 309584025 + 11437924 = 17595^2 + 3382^2 .

It is a cyclic number.

It is not a de Polignac number, because 321021949 - 2¹ = 321021947 is a prime.

Together with 321021947, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 321021949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321021947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160510974 + 160510975.

It is an arithmetic number, because the mean of its divisors is an integer number (160510975).

Almost surely, 2^321021949 is an apocalyptic number.

It is an amenable number.

321021949 is a deficient number, since it is larger than the sum of its proper divisors (1).

321021949 is an equidigital number, since it uses as much as digits as its factorization.

321021949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 321021949 is about 17917.0853935566. The cubic root of 321021949 is about 684.7177333486.

The spelling of 321021949 in words is "three hundred twenty-one million, twenty-one thousand, nine hundred forty-nine".