2021428 has 6 divisors (see below), whose sum is σ = 3537506. Its totient is φ = 1010712.

The previous prime is 2021381. The next prime is 2021431. The reversal of 2021428 is 8241202.

It can be written as a sum of positive squares in only one way, i.e., 1542564 + 478864 = 1242^2 + 692^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 252675 + ... + 252682.

2^2021428 is an apocalyptic number.

It is an amenable number.

2021428 is a deficient number, since it is larger than the sum of its proper divisors (1516078).

2021428 is a wasteful number, since it uses less digits than its factorization.

2021428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505361 (or 505359 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 2021428 is about 1421.7693202485. The cubic root of 2021428 is about 126.4404673345.

The spelling of 2021428 in words is "two million, twenty-one thousand, four hundred twenty-eight".