2171400123 has 32 divisors (see below), whose sum is σ = 3367180800. Its totient is φ = 1234607616.

The previous prime is 2171400107. The next prime is 2171400131. The reversal of 2171400123 is 3210041712.

It is not a de Polignac number, because 2171400123 - 2⁴ = 2171400107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2171400123.

It is not an unprimeable number, because it can be changed into a prime (2171440123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26428 + ... + 71001.

It is an arithmetic number, because the mean of its divisors is an integer number (105224400).

Almost surely, 2^2171400123 is an apocalyptic number.

2171400123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2171400123 is a deficient number, since it is larger than the sum of its proper divisors (1195780677).

2171400123 is a wasteful number, since it uses less digits than its factorization.

2171400123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97491.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 2171400123 is about 46598.2845499703. The cubic root of 2171400123 is about 1294.9309748891.

Adding to 2171400123 its reverse (3210041712), we get a palindrome (5381441835).

The spelling of 2171400123 in words is "two billion, one hundred seventy-one million, four hundred thousand, one hundred twenty-three".