426556221 has 24 divisors (see below), whose sum is σ = 712492704. Its totient is φ = 224995680.

The previous prime is 426556219. The next prime is 426556267. The reversal of 426556221 is 122655624.

It is not a de Polignac number, because 426556221 - 2¹ = 426556219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426556201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109695 + ... + 113516.

It is an arithmetic number, because the mean of its divisors is an integer number (29687196).

Almost surely, 2^426556221 is an apocalyptic number.

It is an amenable number.

426556221 is a deficient number, since it is larger than the sum of its proper divisors (285936483).

426556221 is a wasteful number, since it uses less digits than its factorization.

426556221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223241 (or 223234 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 426556221 is about 20653.2375428164. The cubic root of 426556221 is about 752.7638591543.

The spelling of 426556221 in words is "four hundred twenty-six million, five hundred fifty-six thousand, two hundred twenty-one".