2181017125 has 64 divisors (see below), whose sum is σ = 3467543040. Its totient is φ = 1333324800.

The previous prime is 2181017117. The next prime is 2181017149. The reversal of 2181017125 is 5217101812.

It is not a de Polignac number, because 2181017125 - 2³ = 2181017117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2181017093 and 2181017102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 278767 + ... + 286483.

It is an arithmetic number, because the mean of its divisors is an integer number (54180360).

Almost surely, 2^2181017125 is an apocalyptic number.

2181017125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2181017125 is a deficient number, since it is larger than the sum of its proper divisors (1286525915).

2181017125 is a wasteful number, since it uses less digits than its factorization.

2181017125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7775 (or 7765 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 28.

The square root of 2181017125 is about 46701.3610615365. The cubic root of 2181017125 is about 1296.8398835994.

Adding to 2181017125 its reverse (5217101812), we get a palindrome (7398118937).

The spelling of 2181017125 in words is "two billion, one hundred eighty-one million, seventeen thousand, one hundred twenty-five".