2909107921 has 16 divisors (see below), whose sum is σ = 3059417088. Its totient is φ = 2762701200.

The previous prime is 2909107913. The next prime is 2909107933. The reversal of 2909107921 is 1297019092.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2909107921 - 2³ = 2909107913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2909107021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 487860 + ... + 493786.

It is an arithmetic number, because the mean of its divisors is an integer number (191213568).

Almost surely, 2^2909107921 is an apocalyptic number.

It is an amenable number.

2909107921 is a deficient number, since it is larger than the sum of its proper divisors (150309167).

2909107921 is a wasteful number, since it uses less digits than its factorization.

2909107921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6252.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 2909107921 is about 53936.1467014469. The cubic root of 2909107921 is about 1427.5344936626.

The spelling of 2909107921 in words is "two billion, nine hundred nine million, one hundred seven thousand, nine hundred twenty-one".