2021456 has 10 divisors (see below), whose sum is σ = 3916602. Its totient is φ = 1010720.

The previous prime is 2021431. The next prime is 2021471. The reversal of 2021456 is 6541202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1175056 + 846400 = 1084^2 + 920^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63155 + ... + 63186.

2^2021456 is an apocalyptic number.

It is an amenable number.

2021456 is a deficient number, since it is larger than the sum of its proper divisors (1895146).

2021456 is a wasteful number, since it uses less digits than its factorization.

2021456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126349 (or 126343 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2021456 is about 1421.7791671002. The cubic root of 2021456 is about 126.4410511325.

Adding to 2021456 its reverse (6541202), we get a palindrome (8562658).

The spelling of 2021456 in words is "two million, twenty-one thousand, four hundred fifty-six".