2121455 has 16 divisors (see below), whose sum is σ = 2971200. Its totient is φ = 1453536.

The previous prime is 2121443. The next prime is 2121461. The reversal of 2121455 is 5541212.

It is not a de Polignac number, because 2121455 - 2⁸ = 2121199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1097 + ... + 2333.

It is an arithmetic number, because the mean of its divisors is an integer number (185700).

2^2121455 is an apocalyptic number.

2121455 is a deficient number, since it is larger than the sum of its proper divisors (849745).

2121455 is an equidigital number, since it uses as much as digits as its factorization.

2121455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263 (or 1249 counting only the distinct ones).

The product of its digits is 400, while the sum is 20.

The square root of 2121455 is about 1456.5215412070. The cubic root of 2121455 is about 128.4925480293.

Adding to 2121455 its reverse (5541212), we get a palindrome (7662667).

The spelling of 2121455 in words is "two million, one hundred twenty-one thousand, four hundred fifty-five".