2171231125 has 32 divisors (see below), whose sum is σ = 3155293440. Its totient is φ = 1460721600.

The previous prime is 2171231107. The next prime is 2171231141. The reversal of 2171231125 is 5211321712.

It is not a de Polignac number, because 2171231125 - 2¹⁷ = 2171100053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 2171231125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22966 + ... + 69784.

It is an arithmetic number, because the mean of its divisors is an integer number (98602920).

Almost surely, 2^2171231125 is an apocalyptic number.

2171231125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2171231125 is a deficient number, since it is larger than the sum of its proper divisors (984062315).

2171231125 is an equidigital number, since it uses as much as digits as its factorization.

2171231125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46894 (or 46884 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 2171231125 is about 46596.4711646708. The cubic root of 2171231125 is about 1294.8973796034.

Adding to 2171231125 its reverse (5211321712), we get a palindrome (7382552837).

The spelling of 2171231125 in words is "two billion, one hundred seventy-one million, two hundred thirty-one thousand, one hundred twenty-five".