900923021 has 2 divisors, whose sum is σ = 900923022. Its totient is φ = 900923020.

The previous prime is 900922993. The next prime is 900923081. The reversal of 900923021 is 120329009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 795860521 + 105062500 = 28211^2 + 10250^2 .

It is a cyclic number.

It is not a de Polignac number, because 900923021 - 2¹⁴ = 900906637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (900923081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450461510 + 450461511.

It is an arithmetic number, because the mean of its divisors is an integer number (450461511).

Almost surely, 2^900923021 is an apocalyptic number.

It is an amenable number.

900923021 is a deficient number, since it is larger than the sum of its proper divisors (1).

900923021 is an equidigital number, since it uses as much as digits as its factorization.

900923021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 900923021 is about 30015.3797410594. The cubic root of 900923021 is about 965.8193336785.

The spelling of 900923021 in words is "nine hundred million, nine hundred twenty-three thousand, twenty-one".