2109717621 has 12 divisors (see below), whose sum is σ = 3324403680. Its totient is φ = 1278616680.

The previous prime is 2109717613. The next prime is 2109717661. The reversal of 2109717621 is 1267179012.

It is a happy number.

2109717621 is a `hidden beast` number, since 2 + 10 + 9 + 7 + 17 + 621 = 666.

It is not a de Polignac number, because 2109717621 - 2³ = 2109717613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109717601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10655041 + ... + 10655238.

It is an arithmetic number, because the mean of its divisors is an integer number (277033640).

Almost surely, 2^2109717621 is an apocalyptic number.

It is an amenable number.

2109717621 is a deficient number, since it is larger than the sum of its proper divisors (1214686059).

2109717621 is a wasteful number, since it uses less digits than its factorization.

2109717621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21310296 (or 21310293 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 2109717621 is about 45931.6625107344. The cubic root of 2109717621 is about 1282.5513931276.

The spelling of 2109717621 in words is "two billion, one hundred nine million, seven hundred seventeen thousand, six hundred twenty-one".