421401399985 has 4 divisors (see below), whose sum is σ = 505681679988. Its totient is φ = 337121119984.

The previous prime is 421401399973. The next prime is 421401400001. The reversal of 421401399985 is 589993104124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 295200968976 + 126200431009 = 543324^2 + 355247^2 .

It is a cyclic number.

It is not a de Polignac number, because 421401399985 - 2¹⁷ = 421401268913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 42140139994 + ... + 42140140003.

It is an arithmetic number, because the mean of its divisors is an integer number (126420419997).

Almost surely, 2^421401399985 is an apocalyptic number.

It is an amenable number.

421401399985 is a deficient number, since it is larger than the sum of its proper divisors (84280280003).

421401399985 is an equidigital number, since it uses as much as digits as its factorization.

421401399985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84280280002.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 421401399985 in words is "four hundred twenty-one billion, four hundred one million, three hundred ninety-nine thousand, nine hundred eighty-five".