421727775857 has 4 divisors (see below), whose sum is σ = 421969178736. Its totient is φ = 421486372980.

The previous prime is 421727775853. The next prime is 421727775877. The reversal of 421727775857 is 758577727124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421727775857 - 2² = 421727775853 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 421727775857.

It is not an unprimeable number, because it can be changed into a prime (421727775853) 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, 120698819 + ... + 120702312.

It is an arithmetic number, because the mean of its divisors is an integer number (105492294684).

Almost surely, 2^421727775857 is an apocalyptic number.

It is an amenable number.

421727775857 is a deficient number, since it is larger than the sum of its proper divisors (241402879).

421727775857 is a wasteful number, since it uses less digits than its factorization.

421727775857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241402878.

The product of its digits is 53782400, while the sum is 62.

The spelling of 421727775857 in words is "four hundred twenty-one billion, seven hundred twenty-seven million, seven hundred seventy-five thousand, eight hundred fifty-seven".