421420231 has 4 divisors (see below), whose sum is σ = 435014464. Its totient is φ = 407826000.

The previous prime is 421420217. The next prime is 421420243. The reversal of 421420231 is 132024124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421420231 - 2²³ = 413031623 is a prime.

It is a super-2 number, since 2×421420231² = 355190022192186722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421420199 and 421420208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421420201) 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, 6797070 + ... + 6797131.

It is an arithmetic number, because the mean of its divisors is an integer number (108753616).

Almost surely, 2^421420231 is an apocalyptic number.

421420231 is a deficient number, since it is larger than the sum of its proper divisors (13594233).

421420231 is a wasteful number, since it uses less digits than its factorization.

421420231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13594232.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 421420231 is about 20528.5223774143. The cubic root of 421420231 is about 749.7304103661.

Adding to 421420231 its reverse (132024124), we get a palindrome (553444355).

The spelling of 421420231 in words is "four hundred twenty-one million, four hundred twenty thousand, two hundred thirty-one".