421531131 has 16 divisors (see below), whose sum is σ = 676140800. Its totient is φ = 228197088.

The previous prime is 421531069. The next prime is 421531139. The reversal of 421531131 is 131135124.

It is not a de Polignac number, because 421531131 - 2⁷ = 421531003 is a prime.

It is a super-2 number, since 2×421531131² = 355376988804278322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421531098 and 421531107.

It is not an unprimeable number, because it can be changed into a prime (421531139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527836 + ... + 528633.

It is an arithmetic number, because the mean of its divisors is an integer number (42258800).

Almost surely, 2^421531131 is an apocalyptic number.

421531131 is a deficient number, since it is larger than the sum of its proper divisors (254609669).

421531131 is a wasteful number, since it uses less digits than its factorization.

421531131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056498.

The product of its digits is 360, while the sum is 21.

The square root of 421531131 is about 20531.2233196174. The cubic root of 421531131 is about 749.7961703874.

Adding to 421531131 its reverse (131135124), we get a palindrome (552666255).

The spelling of 421531131 in words is "four hundred twenty-one million, five hundred thirty-one thousand, one hundred thirty-one".