2116921317 has 16 divisors (see below), whose sum is σ = 3257726592. Its totient is φ = 1197691200.

The previous prime is 2116921297. The next prime is 2116921333. The reversal of 2116921317 is 7131296112.

It is not a de Polignac number, because 2116921317 - 2⁶ = 2116921253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2116921117) 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, 496918 + ... + 501159.

It is an arithmetic number, because the mean of its divisors is an integer number (203607912).

Almost surely, 2^2116921317 is an apocalyptic number.

It is an amenable number.

2116921317 is a deficient number, since it is larger than the sum of its proper divisors (1140805275).

2116921317 is a wasteful number, since it uses less digits than its factorization.

2116921317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998188.

The product of its digits is 4536, while the sum is 33.

The square root of 2116921317 is about 46010.0132253839. The cubic root of 2116921317 is about 1284.0095052479.

It can be divided in two parts, 21169 and 21317, that added together give a triangular number (42486 = T₂₉₁).

The spelling of 2116921317 in words is "two billion, one hundred sixteen million, nine hundred twenty-one thousand, three hundred seventeen".