421213431 has 8 divisors (see below), whose sum is σ = 569311600. Its totient is φ = 276962112.

The previous prime is 421213411. The next prime is 421213493. The reversal of 421213431 is 134312124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421213431 - 2²³ = 412824823 is a prime.

It is a super-2 number, since 2×421213431² = 354841508909583522, 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 = 421213398 and 421213407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421213411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961456 + ... + 961893.

It is an arithmetic number, because the mean of its divisors is an integer number (71163950).

Almost surely, 2^421213431 is an apocalyptic number.

421213431 is a deficient number, since it is larger than the sum of its proper divisors (148098169).

421213431 is a wasteful number, since it uses less digits than its factorization.

421213431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923425.

The product of its digits is 576, while the sum is 21.

The square root of 421213431 is about 20523.4848649054. The cubic root of 421213431 is about 749.6077540043.

Adding to 421213431 its reverse (134312124), we get a palindrome (555525555).

The spelling of 421213431 in words is "four hundred twenty-one million, two hundred thirteen thousand, four hundred thirty-one".