2121914860 has 96 divisors (see below), whose sum is σ = 4903778880. Its totient is φ = 766537728.

The previous prime is 2121914849. The next prime is 2121914863. The reversal of 2121914860 is 684191212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2121914863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2475552 + ... + 2476408.

It is an arithmetic number, because the mean of its divisors is an integer number (51081030).

Almost surely, 2^2121914860 is an apocalyptic number.

2121914860 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 2121914860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2451889440).

2121914860 is an abundant number, since it is smaller than the sum of its proper divisors (2781864020).

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

2121914860 is a wasteful number, since it uses less digits than its factorization.

2121914860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 2121914860 is about 46064.2470903411. The cubic root of 2121914860 is about 1285.0183164432.

The spelling of 2121914860 in words is "two billion, one hundred twenty-one million, nine hundred fourteen thousand, eight hundred sixty".