2122187845 has 4 divisors (see below), whose sum is σ = 2546625420. Its totient is φ = 1697750272.

The previous prime is 2122187827. The next prime is 2122187849. The reversal of 2122187845 is 5487812212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1584597249 + 537590596 = 39807^2 + 23186^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122187845 - 2²⁹ = 1585316933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2122187798 and 2122187807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122187849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212218780 + ... + 212218789.

It is an arithmetic number, because the mean of its divisors is an integer number (636656355).

Almost surely, 2^2122187845 is an apocalyptic number.

It is an amenable number.

2122187845 is a deficient number, since it is larger than the sum of its proper divisors (424437575).

2122187845 is an equidigital number, since it uses as much as digits as its factorization.

2122187845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424437574.

The product of its digits is 71680, while the sum is 40.

The square root of 2122187845 is about 46067.2100848315. The cubic root of 2122187845 is about 1285.0734200809.

The spelling of 2122187845 in words is "two billion, one hundred twenty-two million, one hundred eighty-seven thousand, eight hundred forty-five".