2123145 has 16 divisors (see below), whose sum is σ = 3774720. Its totient is φ = 1132272.

The previous prime is 2123141. The next prime is 2123161. The reversal of 2123145 is 5413212.

2123145 = T₇₄ + T₇₅ + ... + T₂₃₅.

It is not a de Polignac number, because 2123145 - 2² = 2123141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2123141) 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, 7729 + ... + 7998.

It is an arithmetic number, because the mean of its divisors is an integer number (235920).

2^2123145 is an apocalyptic number.

It is an amenable number.

2123145 is a deficient number, since it is larger than the sum of its proper divisors (1651575).

2123145 is a wasteful number, since it uses less digits than its factorization.

2123145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15741 (or 15735 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 2123145 is about 1457.1015750455. The cubic root of 2123145 is about 128.5266590159.

Adding to 2123145 its reverse (5413212), we get a palindrome (7536357).

The spelling of 2123145 in words is "two million, one hundred twenty-three thousand, one hundred forty-five".