1056421 has 4 divisors (see below), whose sum is σ = 1062144. Its totient is φ = 1050700.

The previous prime is 1056401. The next prime is 1056443. The reversal of 1056421 is 1246501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1056421 - 2¹¹ = 1054373 is a prime.

It is a super-2 number, since 2×1056421² = 2232050658482, which contains 22 as substring.

It is a Duffinian number.

1056421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2575 + ... + 2956.

It is an arithmetic number, because the mean of its divisors is an integer number (265536).

2^1056421 is an apocalyptic number.

It is an amenable number.

1056421 is a deficient number, since it is larger than the sum of its proper divisors (5723).

1056421 is an equidigital number, since it uses as much as digits as its factorization.

1056421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5722.

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

The square root of 1056421 is about 1027.8234284156. The cubic root of 1056421 is about 101.8463983090.

It can be divided in two parts, 10564 and 21, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 1056421 in words is "one million, fifty-six thousand, four hundred twenty-one".