421403131 has 4 divisors (see below), whose sum is σ = 422892472. Its totient is φ = 419913792.

The previous prime is 421403093. The next prime is 421403137. The reversal of 421403131 is 131304124.

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 421403131 - 2²³ = 413014523 is a prime.

It is a super-2 number, since 2×421403131² = 355161197633206322, 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 = 421403099 and 421403108.

It is not an unprimeable number, because it can be changed into a prime (421403137) 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 3 ways as a sum of consecutive naturals, for example, 744246 + ... + 744811.

It is an arithmetic number, because the mean of its divisors is an integer number (105723118).

Almost surely, 2^421403131 is an apocalyptic number.

421403131 is a deficient number, since it is larger than the sum of its proper divisors (1489341).

421403131 is a wasteful number, since it uses less digits than its factorization.

421403131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489340.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 421403131 is about 20528.1058795009. The cubic root of 421403131 is about 749.7202696068.

Adding to 421403131 its reverse (131304124), we get a palindrome (552707255).

The spelling of 421403131 in words is "four hundred twenty-one million, four hundred three thousand, one hundred thirty-one".