2121925988 has 144 divisors (see below), whose sum is σ = 4831130304. Its totient is φ = 807770880.

The previous prime is 2121925937. The next prime is 2121926011. The reversal of 2121925988 is 8895291212.

It is a happy number.

It is a super-2 number, since 2×2121925988² = 9005139797099552288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11723258 + ... + 11723438.

It is an arithmetic number, because the mean of its divisors is an integer number (33549516).

Almost surely, 2^2121925988 is an apocalyptic number.

2121925988 is a gapful number since it is divisible by the number (28) 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 2121925988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2415565152).

2121925988 is an abundant number, since it is smaller than the sum of its proper divisors (2709204316).

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

2121925988 is a wasteful number, since it uses less digits than its factorization.

2121925988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 353 counting only the distinct ones).

The product of its digits is 207360, while the sum is 47.

The square root of 2121925988 is about 46064.3678780031. The cubic root of 2121925988 is about 1285.0205627882.

The spelling of 2121925988 in words is "two billion, one hundred twenty-one million, nine hundred twenty-five thousand, nine hundred eighty-eight".