421540031 has 4 divisors (see below), whose sum is σ = 459861864. Its totient is φ = 383218200.

The previous prime is 421540013. The next prime is 421540037. The reversal of 421540031 is 130045124.

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 421540031 - 2²² = 417345727 is a prime.

It is a super-2 number, since 2×421540031² = 355391995470961922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 421539985 and 421540012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421540037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19160900 + ... + 19160921.

It is an arithmetic number, because the mean of its divisors is an integer number (114965466).

Almost surely, 2^421540031 is an apocalyptic number.

421540031 is a deficient number, since it is larger than the sum of its proper divisors (38321833).

421540031 is a wasteful number, since it uses less digits than its factorization.

421540031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38321832.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 421540031 is about 20531.4400615252. The cubic root of 421540031 is about 749.8014472923.

Adding to 421540031 its reverse (130045124), we get a palindrome (551585155).

The spelling of 421540031 in words is "four hundred twenty-one million, five hundred forty thousand, thirty-one".