2121256 has 8 divisors (see below), whose sum is σ = 3977370. Its totient is φ = 1060624.

The previous prime is 2121253. The next prime is 2121271. The reversal of 2121256 is 6521212.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 933156 = 1090^2 + 966^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (2121253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132571 + ... + 132586.

2^2121256 is an apocalyptic number.

It is an amenable number.

2121256 is a deficient number, since it is larger than the sum of its proper divisors (1856114).

2121256 is a wasteful number, since it uses less digits than its factorization.

2121256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265163 (or 265159 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 2121256 is about 1456.4532261628. The cubic root of 2121256 is about 128.4885302182.

Adding to 2121256 its reverse (6521212), we get a palindrome (8642468).

The spelling of 2121256 in words is "two million, one hundred twenty-one thousand, two hundred fifty-six".