2161025700 has 72 divisors (see below), whose sum is σ = 6421588992. Its totient is φ = 560695680.

The previous prime is 2161025677. The next prime is 2161025719. The reversal of 2161025700 is 75201612.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86244 + ... + 108443.

It is an arithmetic number, because the mean of its divisors is an integer number (89188736).

Almost surely, 2^2161025700 is an apocalyptic number.

2161025700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161025700 is an abundant number, since it is smaller than the sum of its proper divisors (4260563292).

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

2161025700 is a wasteful number, since it uses less digits than its factorization.

2161025700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194741 (or 194734 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 2161025700 is about 46486.8336198541. The cubic root of 2161025700 is about 1292.8653930905.

The spelling of 2161025700 in words is "two billion, one hundred sixty-one million, twenty-five thousand, seven hundred".