2251121740 has 72 divisors (see below), whose sum is σ = 5576794272. Its totient is φ = 760919040.

The previous prime is 2251121731. The next prime is 2251121791. The reversal of 2251121740 is 471211522.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 53404 + ... + 85756.

It is an arithmetic number, because the mean of its divisors is an integer number (77455476).

Almost surely, 2^2251121740 is an apocalyptic number.

2251121740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2251121740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2788397136).

2251121740 is an abundant number, since it is smaller than the sum of its proper divisors (3325672532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2251121740 is a wasteful number, since it uses less digits than its factorization.

2251121740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32447 (or 32438 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 2251121740 is about 47445.9876069621. The cubic root of 2251121740 is about 1310.5884231816.

The spelling of 2251121740 in words is "two billion, two hundred fifty-one million, one hundred twenty-one thousand, seven hundred forty".