2120085691 has 8 divisors (see below), whose sum is σ = 2317209984. Its totient is φ = 1931007360.

The previous prime is 2120085677. The next prime is 2120085707. The reversal of 2120085691 is 1965800212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2120085691 - 2²⁷ = 1985867963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2120085661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2010940 + ... + 2011993.

It is an arithmetic number, because the mean of its divisors is an integer number (289651248).

Almost surely, 2^2120085691 is an apocalyptic number.

2120085691 is a deficient number, since it is larger than the sum of its proper divisors (197124293).

2120085691 is a wasteful number, since it uses less digits than its factorization.

2120085691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4022981.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 2120085691 is about 46044.3882682787. The cubic root of 2120085691 is about 1284.6489658710.

The spelling of 2120085691 in words is "two billion, one hundred twenty million, eighty-five thousand, six hundred ninety-one".