900322021 has 2 divisors, whose sum is σ = 900322022. Its totient is φ = 900322020.

The previous prime is 900322001. The next prime is 900322037. The reversal of 900322021 is 120223009.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 647957025 + 252364996 = 25455^2 + 15886^2 .

It is a cyclic number.

It is not a de Polignac number, because 900322021 - 2²⁷ = 766104293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 900322021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (900322001) 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, 450161010 + 450161011.

It is an arithmetic number, because the mean of its divisors is an integer number (450161011).

Almost surely, 2^900322021 is an apocalyptic number.

It is an amenable number.

900322021 is a deficient number, since it is larger than the sum of its proper divisors (1).

900322021 is an equidigital number, since it uses as much as digits as its factorization.

900322021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 900322021 is about 30005.3665366714. The cubic root of 900322021 is about 965.6045219328.

The spelling of 900322021 in words is "nine hundred million, three hundred twenty-two thousand, twenty-one".