421511322623 has 4 divisors (see below), whose sum is σ = 421516575480. Its totient is φ = 421506069768.

The previous prime is 421511322613. The next prime is 421511322649. The reversal of 421511322623 is 326223115124.

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 421511322623 - 2⁸ = 421511322367 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421511322623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421511322613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2504165 + ... + 2667182.

It is an arithmetic number, because the mean of its divisors is an integer number (105379143870).

Almost surely, 2^421511322623 is an apocalyptic number.

421511322623 is a deficient number, since it is larger than the sum of its proper divisors (5252857).

421511322623 is an equidigital number, since it uses as much as digits as its factorization.

421511322623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5252856.

The product of its digits is 17280, while the sum is 32.

Adding to 421511322623 its reverse (326223115124), we get a palindrome (747734437747).

The spelling of 421511322623 in words is "four hundred twenty-one billion, five hundred eleven million, three hundred twenty-two thousand, six hundred twenty-three".