2056421 has 2 divisors, whose sum is σ = 2056422. Its totient is φ = 2056420.

The previous prime is 2056409. The next prime is 2056441. The reversal of 2056421 is 1246502.

It is a happy number.

It is an a-pointer prime, because the next prime (2056441) can be obtained adding 2056421 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 835396 = 1105^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 2056421 - 2⁶ = 2056357 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2056393 and 2056402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2056441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1028210 + 1028211.

It is an arithmetic number, because the mean of its divisors is an integer number (1028211).

2^2056421 is an apocalyptic number.

It is an amenable number.

2056421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2056421 is an equidigital number, since it uses as much as digits as its factorization.

2056421 is an evil number, because the sum of its binary digits is even.

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

The square root of 2056421 is about 1434.0226636982. The cubic root of 2056421 is about 127.1659021838.

The spelling of 2056421 in words is "two million, fifty-six thousand, four hundred twenty-one".