2909889135921 has 16 divisors (see below), whose sum is σ = 3889148256000. Its totient is φ = 1935279510528.

The previous prime is 2909889135913. The next prime is 2909889135947. The reversal of 2909889135921 is 1295319889092.

It is a happy number.

It is not a de Polignac number, because 2909889135921 - 2³ = 2909889135913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2909889135221) 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 in 15 ways as a sum of consecutive naturals, for example, 7952920 + ... + 8310758.

It is an arithmetic number, because the mean of its divisors is an integer number (243071766000).

Almost surely, 2^{2909889135921} is an apocalyptic number.

It is an amenable number.

2909889135921 is a deficient number, since it is larger than the sum of its proper divisors (979259120079).

2909889135921 is a wasteful number, since it uses less digits than its factorization.

2909889135921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364328.

The product of its (nonzero) digits is 25194240, while the sum is 66.

The spelling of 2909889135921 in words is "two trillion, nine hundred nine billion, eight hundred eighty-nine million, one hundred thirty-five thousand, nine hundred twenty-one".