421031310021 has 64 divisors (see below), whose sum is σ = 729532108800. Its totient is φ = 235023768000.

The previous prime is 421031309977. The next prime is 421031310043. The reversal of 421031310021 is 120013130124.

421031310021 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 421031310021 - 2²¹ = 421029212869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421031309976 and 421031310003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421031310221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1318746 + ... + 1606596.

It is an arithmetic number, because the mean of its divisors is an integer number (11398939200).

Almost surely, 2^421031310021 is an apocalyptic number.

It is an amenable number.

421031310021 is a deficient number, since it is larger than the sum of its proper divisors (308500798779).

421031310021 is a wasteful number, since it uses less digits than its factorization.

421031310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288047 (or 288041 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 421031310021 its reverse (120013130124), we get a palindrome (541044440145).

The spelling of 421031310021 in words is "four hundred twenty-one billion, thirty-one million, three hundred ten thousand, twenty-one".