421889221 has 32 divisors (see below), whose sum is σ = 498760416. Its totient is φ = 353280000.

The previous prime is 421889213. The next prime is 421889239. The reversal of 421889221 is 122988124.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 104550625 + 317338596 = 10225^2 + 17814^2 .

It is a cyclic number.

It is not a de Polignac number, because 421889221 - 2³ = 421889213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421889291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 914931 + ... + 915391.

It is an arithmetic number, because the mean of its divisors is an integer number (15586263).

Almost surely, 2^421889221 is an apocalyptic number.

421889221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

421889221 is a deficient number, since it is larger than the sum of its proper divisors (76871195).

421889221 is a wasteful number, since it uses less digits than its factorization.

421889221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633.

The product of its digits is 18432, while the sum is 37.

The square root of 421889221 is about 20539.9420885260. The cubic root of 421889221 is about 750.0084271646.

It can be divided in two parts, 4218 and 89221, that added together give a palindrome (93439).

The spelling of 421889221 in words is "four hundred twenty-one million, eight hundred eighty-nine thousand, two hundred twenty-one".