421431121 has 4 divisors (see below), whose sum is σ = 424016752. Its totient is φ = 418845492.

The previous prime is 421431119. The next prime is 421431137. The reversal of 421431121 is 121134124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421431121 - 2¹ = 421431119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421431151) 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, 1292571 + ... + 1292896.

It is an arithmetic number, because the mean of its divisors is an integer number (106004188).

Almost surely, 2^421431121 is an apocalyptic number.

It is an amenable number.

421431121 is a deficient number, since it is larger than the sum of its proper divisors (2585631).

421431121 is a wasteful number, since it uses less digits than its factorization.

421431121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585630.

The product of its digits is 192, while the sum is 19.

The square root of 421431121 is about 20528.7876164181. The cubic root of 421431121 is about 749.7368682857.

Adding to 421431121 its reverse (121134124), we get a palindrome (542565245).

It can be divided in two parts, 42143 and 1121, that added together give a square (43264 = 208²).

The spelling of 421431121 in words is "four hundred twenty-one million, four hundred thirty-one thousand, one hundred twenty-one".