2109925881 has 32 divisors (see below), whose sum is σ = 3577977600. Its totient is φ = 1203776640.

The previous prime is 2109925871. The next prime is 2109925891. The reversal of 2109925881 is 1885299012.

It is an interprime number because it is at equal distance from previous prime (2109925871) and next prime (2109925891).

It is not a de Polignac number, because 2109925881 - 2¹⁵ = 2109893113 is a prime.

It is a super-2 number, since 2×2109925881² = 8903574446627252322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2109925841) 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, 116485 + ... + 133373.

It is an arithmetic number, because the mean of its divisors is an integer number (111811800).

Almost surely, 2^2109925881 is an apocalyptic number.

2109925881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2109925881 is a deficient number, since it is larger than the sum of its proper divisors (1468051719).

2109925881 is a wasteful number, since it uses less digits than its factorization.

2109925881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17566 (or 17560 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 2109925881 is about 45933.9295183854. The cubic root of 2109925881 is about 1282.5935939356.

The spelling of 2109925881 in words is "two billion, one hundred nine million, nine hundred twenty-five thousand, eight hundred eighty-one".