2257021 has 4 divisors (see below), whose sum is σ = 2430652. Its totient is φ = 2083392.

The previous prime is 2257007. The next prime is 2257049. The reversal of 2257021 is 1207522.

2257021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1207522 = 2 ⋅603761.

It can be written as a sum of positive squares in 2 ways, for example, as 783225 + 1473796 = 885^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 2257021 - 2²¹ = 159869 is a prime.

It is a Duffinian number.

2257021 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2257021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2257001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86796 + ... + 86821.

It is an arithmetic number, because the mean of its divisors is an integer number (607663).

2^2257021 is an apocalyptic number.

It is an amenable number.

2257021 is a deficient number, since it is larger than the sum of its proper divisors (173631).

2257021 is a wasteful number, since it uses less digits than its factorization.

2257021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173630.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 2257021 is about 1502.3385104563. The cubic root of 2257021 is about 131.1732261510.

The spelling of 2257021 in words is "two million, two hundred fifty-seven thousand, twenty-one".