2171125400181 has 16 divisors (see below), whose sum is σ = 2898964138560. Its totient is φ = 1445352491520.

The previous prime is 2171125400131. The next prime is 2171125400183. The reversal of 2171125400181 is 1810045211712.

It is a happy number.

It is not a de Polignac number, because 2171125400181 - 2¹⁸ = 2171125138037 is a prime.

It is a super-2 number, since 2×2171125400181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171125400183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12891525 + ... + 13058853.

It is an arithmetic number, because the mean of its divisors is an integer number (181185258660).

Almost surely, 2^{2171125400181} is an apocalyptic number.

It is an amenable number.

2171125400181 is a deficient number, since it is larger than the sum of its proper divisors (727838738379).

2171125400181 is a wasteful number, since it uses less digits than its factorization.

2171125400181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173476.

The product of its (nonzero) digits is 4480, while the sum is 33.

The spelling of 2171125400181 in words is "two trillion, one hundred seventy-one billion, one hundred twenty-five million, four hundred thousand, one hundred eighty-one".