2121456 has 40 divisors (see below), whose sum is σ = 5532880. Its totient is φ = 700416.

The previous prime is 2121443. The next prime is 2121461. The reversal of 2121456 is 6541212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9150 + ... + 9378.

It is an arithmetic number, because the mean of its divisors is an integer number (138322).

2^2121456 is an apocalyptic number.

It is an amenable number.

2121456 is an abundant number, since it is smaller than the sum of its proper divisors (3411424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2121456 is a wasteful number, since it uses less digits than its factorization.

2121456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 427 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 2121456 is about 1456.5218844906. The cubic root of 2121456 is about 128.4925682187.

Adding to 2121456 its reverse (6541212), we get a palindrome (8662668).

The spelling of 2121456 in words is "two million, one hundred twenty-one thousand, four hundred fifty-six".