2909190921 has 16 divisors (see below), whose sum is σ = 4774057344. Its totient is φ = 1534518144.

The previous prime is 2909190917. The next prime is 2909190937. The reversal of 2909190921 is 1290919092.

It is not a de Polignac number, because 2909190921 - 2² = 2909190917 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2909190901) 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, 5327916 + ... + 5328461.

It is an arithmetic number, because the mean of its divisors is an integer number (298378584).

Almost surely, 2^2909190921 is an apocalyptic number.

2909190921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2909190921 is a deficient number, since it is larger than the sum of its proper divisors (1864866423).

2909190921 is a wasteful number, since it uses less digits than its factorization.

2909190921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10656400.

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 2909190921 is about 53936.9161243021. The cubic root of 2909190921 is about 1427.5480699019.

It can be divided in two parts, 29091909 and 21, that multiplied together give a square (610930089 = 24717²).

The spelling of 2909190921 in words is "two billion, nine hundred nine million, one hundred ninety thousand, nine hundred twenty-one".