902909299921 has 4 divisors (see below), whose sum is σ = 902931713332. Its totient is φ = 902886886512.

The previous prime is 902909299889. The next prime is 902909299949. The reversal of 902909299921 is 129992909209.

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 322295779521 + 580613520400 = 567711^2 + 761980^2 .

It is a cyclic number.

It is not a de Polignac number, because 902909299921 - 2⁵ = 902909299889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 902909299921.

It is not an unprimeable number, because it can be changed into a prime (902909299991) 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 3 ways as a sum of consecutive naturals, for example, 11146170 + ... + 11226883.

It is an arithmetic number, because the mean of its divisors is an integer number (225732928333).

Almost surely, 2^902909299921 is an apocalyptic number.

It is an amenable number.

902909299921 is a deficient number, since it is larger than the sum of its proper divisors (22413411).

902909299921 is a wasteful number, since it uses less digits than its factorization.

902909299921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22413410.

The product of its (nonzero) digits is 4251528, while the sum is 61.

The spelling of 902909299921 in words is "nine hundred two billion, nine hundred nine million, two hundred ninety-nine thousand, nine hundred twenty-one".