2121925 has 12 divisors (see below), whose sum is σ = 2834020. Its totient is φ = 1566720.

The previous prime is 2121907. The next prime is 2121941. The reversal of 2121925 is 5291212.

2121925 = 181² + 182² + ... + 230².

It can be written as a sum of positive squares in 6 ways, for example, as 638401 + 1483524 = 799^2 + 1218^2 .

It is not a de Polignac number, because 2121925 - 2⁵ = 2121893 is a prime.

2121925 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2121896 and 2121905.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2940 + ... + 3589.

2^2121925 is an apocalyptic number.

2121925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121925 is a deficient number, since it is larger than the sum of its proper divisors (712095).

2121925 is a wasteful number, since it uses less digits than its factorization.

2121925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6552 (or 6547 counting only the distinct ones).

The product of its digits is 360, while the sum is 22.

The square root of 2121925 is about 1456.6828755772. The cubic root of 2121925 is about 128.5020363347.

The spelling of 2121925 in words is "two million, one hundred twenty-one thousand, nine hundred twenty-five".