2121225 has 12 divisors (see below), whose sum is σ = 3507216. Its totient is φ = 1131280.

The previous prime is 2121199. The next prime is 2121239. The reversal of 2121225 is 5221212.

It is not a de Polignac number, because 2121225 - 2⁵ = 2121193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14067 + ... + 14216.

It is an arithmetic number, because the mean of its divisors is an integer number (292268).

2^2121225 is an apocalyptic number.

2121225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121225 is a deficient number, since it is larger than the sum of its proper divisors (1385991).

2121225 is a wasteful number, since it uses less digits than its factorization.

2121225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28296 (or 28291 counting only the distinct ones).

The product of its digits is 80, while the sum is 15.

The square root of 2121225 is about 1456.4425838323. The cubic root of 2121225 is about 128.4879043054.

Adding to 2121225 its reverse (5221212), we get a palindrome (7342437).

It can be divided in two parts, 2121 and 225, that added together give a triangular number (2346 = T₆₈).

The spelling of 2121225 in words is "two million, one hundred twenty-one thousand, two hundred twenty-five".