421267021243 has 4 divisors (see below), whose sum is σ = 421417315528. Its totient is φ = 421116726960.

The previous prime is 421267021229. The next prime is 421267021247. The reversal of 421267021243 is 342120762124.

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 421267021243 - 2⁹ = 421267020731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421267021199 and 421267021208.

It is not an unprimeable number, because it can be changed into a prime (421267021247) 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, 75142938 + ... + 75148543.

It is an arithmetic number, because the mean of its divisors is an integer number (105354328882).

Almost surely, 2^421267021243 is an apocalyptic number.

421267021243 is a deficient number, since it is larger than the sum of its proper divisors (150294285).

421267021243 is a wasteful number, since it uses less digits than its factorization.

421267021243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150294284.

The product of its (nonzero) digits is 32256, while the sum is 34.

Adding to 421267021243 its reverse (342120762124), we get a palindrome (763387783367).

The spelling of 421267021243 in words is "four hundred twenty-one billion, two hundred sixty-seven million, twenty-one thousand, two hundred forty-three".