421381221 has 24 divisors (see below), whose sum is σ = 594872064. Its totient is φ = 265282560.

The previous prime is 421381211. The next prime is 421381241. The reversal of 421381221 is 122183124.

It is not a de Polignac number, because 421381221 - 2¹⁴ = 421364837 is a prime.

It is a super-2 number, since 2×421381221² = 355124266822901682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421381191 and 421381200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421381211) 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, 657061 + ... + 657701.

It is an arithmetic number, because the mean of its divisors is an integer number (24786336).

Almost surely, 2^421381221 is an apocalyptic number.

It is an amenable number.

421381221 is a deficient number, since it is larger than the sum of its proper divisors (173490843).

421381221 is a wasteful number, since it uses less digits than its factorization.

421381221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289 (or 1270 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 421381221 is about 20527.5722139760. The cubic root of 421381221 is about 749.7072759873.

The spelling of 421381221 in words is "four hundred twenty-one million, three hundred eighty-one thousand, two hundred twenty-one".