2161925620 has 48 divisors (see below), whose sum is σ = 4688449920. Its totient is φ = 836873856.

The previous prime is 2161925603. The next prime is 2161925629. The reversal of 2161925620 is 265291612.

It is a happy number.

2161925620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161925629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82209 + ... + 105271.

It is an arithmetic number, because the mean of its divisors is an integer number (97676040).

Almost surely, 2^2161925620 is an apocalyptic number.

2161925620 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 2161925620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2344224960).

2161925620 is an abundant number, since it is smaller than the sum of its proper divisors (2526524300).

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

2161925620 is a wasteful number, since it uses less digits than its factorization.

2161925620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23224 (or 23222 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 2161925620 is about 46496.5119121854. The cubic root of 2161925620 is about 1293.0448316412.

The spelling of 2161925620 in words is "two billion, one hundred sixty-one million, nine hundred twenty-five thousand, six hundred twenty".