900002921 has 4 divisors (see below), whose sum is σ = 900173892. Its totient is φ = 899831952.

The previous prime is 900002897. The next prime is 900002941. The reversal of 900002921 is 129200009.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178489600 + 721513321 = 13360^2 + 26861^2 .

It is a cyclic number.

It is not a de Polignac number, because 900002921 - 2¹⁰ = 900001897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900002941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77330 + ... + 88203.

It is an arithmetic number, because the mean of its divisors is an integer number (225043473).

Almost surely, 2^900002921 is an apocalyptic number.

It is an amenable number.

900002921 is a deficient number, since it is larger than the sum of its proper divisors (170971).

900002921 is a wasteful number, since it uses less digits than its factorization.

900002921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170970.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 900002921 is about 30000.0486832938. The cubic root of 900002921 is about 965.4904291210.

The spelling of 900002921 in words is "nine hundred million, two thousand, nine hundred twenty-one".