2121825 has 24 divisors (see below), whose sum is σ = 3695200. Its totient is φ = 1071360.

The previous prime is 2121809. The next prime is 2121829. The reversal of 2121825 is 5281212.

It is a happy number.

It is not a de Polignac number, because 2121825 - 2⁴ = 2121809 is a prime.

2121825 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2121829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 681 + ... + 2169.

2^2121825 is an apocalyptic number.

2121825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121825 is a deficient number, since it is larger than the sum of its proper divisors (1573375).

2121825 is a wasteful number, since it uses less digits than its factorization.

2121825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1516 counting only the distinct ones).

The product of its digits is 320, while the sum is 21.

The square root of 2121825 is about 1456.6485506120. The cubic root of 2121825 is about 128.5000176637.

The spelling of 2121825 in words is "two million, one hundred twenty-one thousand, eight hundred twenty-five".