421755285085 has 4 divisors (see below), whose sum is σ = 506106342108. Its totient is φ = 337404228064.

The previous prime is 421755285073. The next prime is 421755285113. The reversal of 421755285085 is 580582557124.

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 231482227876 + 190273057209 = 481126^2 + 436203^2 .

It is a cyclic number.

It is not a de Polignac number, because 421755285085 - 2⁵ = 421755285053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42175528504 + ... + 42175528513.

It is an arithmetic number, because the mean of its divisors is an integer number (126526585527).

Almost surely, 2^421755285085 is an apocalyptic number.

It is an amenable number.

421755285085 is a deficient number, since it is larger than the sum of its proper divisors (84351057023).

421755285085 is an equidigital number, since it uses as much as digits as its factorization.

421755285085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84351057022.

The product of its (nonzero) digits is 4480000, while the sum is 52.

The spelling of 421755285085 in words is "four hundred twenty-one billion, seven hundred fifty-five million, two hundred eighty-five thousand, eighty-five".