2171072721125 has 32 divisors (see below), whose sum is σ = 3378076386048. Its totient is φ = 1353395976000.

The previous prime is 2171072721119. The next prime is 2171072721149. The reversal of 2171072721125 is 5211272701712.

It is a happy number.

It is not a de Polignac number, because 2171072721125 - 2¹² = 2171072717029 is a prime.

It is a super-2 number, since 2×2171072721125² (a number of 25 digits) contains 22 as substring.

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, 112773374 + ... + 112792623.

It is an arithmetic number, because the mean of its divisors is an integer number (105564887064).

Almost surely, 2^{2171072721125} is an apocalyptic number.

2171072721125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2171072721125 is a deficient number, since it is larger than the sum of its proper divisors (1207003664923).

2171072721125 is a wasteful number, since it uses less digits than its factorization.

2171072721125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225566030 (or 225566020 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 38.

The spelling of 2171072721125 in words is "two trillion, one hundred seventy-one billion, seventy-two million, seven hundred twenty-one thousand, one hundred twenty-five".