421800727977 has 6 divisors (see below), whose sum is σ = 609267718202. Its totient is φ = 281200485312.

The previous prime is 421800727969. The next prime is 421800727991. The reversal of 421800727977 is 779727008124.

421800727977 is a `hidden beast` number, since 421 + 80 + 0 + 7 + 2 + 79 + 77 = 666.

It can be written as a sum of positive squares in only one way, i.e., 405041872041 + 16758855936 = 636429^2 + 129456^2 .

It is not a de Polignac number, because 421800727977 - 2³ = 421800727969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421800727927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23433373768 + ... + 23433373785.

Almost surely, 2^421800727977 is an apocalyptic number.

It is an amenable number.

421800727977 is a deficient number, since it is larger than the sum of its proper divisors (187466990225).

421800727977 is a wasteful number, since it uses less digits than its factorization.

421800727977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46866747559 (or 46866747556 counting only the distinct ones).

The product of its (nonzero) digits is 2765952, while the sum is 54.

The spelling of 421800727977 in words is "four hundred twenty-one billion, eight hundred million, seven hundred twenty-seven thousand, nine hundred seventy-seven".