2251121685 has 32 divisors (see below), whose sum is σ = 3639461760. Its totient is φ = 1188096000.

The previous prime is 2251121671. The next prime is 2251121689. The reversal of 2251121685 is 5861211522.

It is not a de Polignac number, because 2251121685 - 2⁷ = 2251121557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2251121689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 802285 + ... + 805085.

It is an arithmetic number, because the mean of its divisors is an integer number (113733180).

Almost surely, 2^2251121685 is an apocalyptic number.

It is an amenable number.

2251121685 is a deficient number, since it is larger than the sum of its proper divisors (1388340075).

2251121685 is a wasteful number, since it uses less digits than its factorization.

2251121685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349.

The product of its digits is 9600, while the sum is 33.

The square root of 2251121685 is about 47445.9870273556. The cubic root of 2251121685 is about 1310.5884125081.

The spelling of 2251121685 in words is "two billion, two hundred fifty-one million, one hundred twenty-one thousand, six hundred eighty-five".