421543126999 has 4 divisors (see below), whose sum is σ = 421547187064. Its totient is φ = 421539066936.

The previous prime is 421543126987. The next prime is 421543127053. The reversal of 421543126999 is 999621345124.

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 421543126999 - 2¹⁷ = 421542995927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421543121999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1870092 + ... + 2083345.

It is an arithmetic number, because the mean of its divisors is an integer number (105386796766).

Almost surely, 2^421543126999 is an apocalyptic number.

421543126999 is a deficient number, since it is larger than the sum of its proper divisors (4060065).

421543126999 is a wasteful number, since it uses less digits than its factorization.

421543126999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060064.

The product of its digits is 4199040, while the sum is 55.

The spelling of 421543126999 in words is "four hundred twenty-one billion, five hundred forty-three million, one hundred twenty-six thousand, nine hundred ninety-nine".