900021123621 has 12 divisors (see below), whose sum is σ = 1335166472172. Its totient is φ = 583797485376.

The previous prime is 900021123571. The next prime is 900021123641. The reversal of 900021123621 is 126321120009.

900021123621 is a `hidden beast` number, since 9 + 0 + 0 + 0 + 2 + 11 + 23 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 525704753025 + 374316370596 = 725055^2 + 611814^2 .

It is not a de Polignac number, because 900021123621 - 2⁹ = 900021123109 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900021123641) 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 in 11 ways as a sum of consecutive naturals, for example, 1351382736 + ... + 1351383401.

It is an arithmetic number, because the mean of its divisors is an integer number (111263872681).

Almost surely, 2^900021123621 is an apocalyptic number.

It is an amenable number.

900021123621 is a deficient number, since it is larger than the sum of its proper divisors (435145348551).

900021123621 is a wasteful number, since it uses less digits than its factorization.

900021123621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2702766180 (or 2702766177 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The spelling of 900021123621 in words is "nine hundred billion, twenty-one million, one hundred twenty-three thousand, six hundred twenty-one".