2217720986 has 16 divisors (see below), whose sum is σ = 3599459808. Its totient is φ = 1018710000.

The previous prime is 2217720979. The next prime is 2217721013. The reversal of 2217720986 is 6890277122.

2217720986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196640 + ... + 207611.

It is an arithmetic number, because the mean of its divisors is an integer number (224966238).

Almost surely, 2^2217720986 is an apocalyptic number.

2217720986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2217720986 is a deficient number, since it is larger than the sum of its proper divisors (1381738822).

2217720986 is a wasteful number, since it uses less digits than its factorization.

2217720986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404477.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 2217720986 is about 47092.6850582975. The cubic root of 2217720986 is about 1304.0741976204.

The spelling of 2217720986 in words is "two billion, two hundred seventeen million, seven hundred twenty thousand, nine hundred eighty-six".