421540531331 has 4 divisors (see below), whose sum is σ = 446337033192. Its totient is φ = 396744029472.

The previous prime is 421540531303. The next prime is 421540531361. The reversal of 421540531331 is 133135045124.

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 421540531331 - 2¹⁴ = 421540514947 is a prime.

It is a super-2 number, since 2×421540531331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421540531361) 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, 12398250905 + ... + 12398250938.

It is an arithmetic number, because the mean of its divisors is an integer number (111584258298).

Almost surely, 2^421540531331 is an apocalyptic number.

421540531331 is a deficient number, since it is larger than the sum of its proper divisors (24796501861).

421540531331 is a wasteful number, since it uses less digits than its factorization.

421540531331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24796501860.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 421540531331 its reverse (133135045124), we get a palindrome (554675576455).

The spelling of 421540531331 in words is "four hundred twenty-one billion, five hundred forty million, five hundred thirty-one thousand, three hundred thirty-one".