421806856365 has 24 divisors (see below), whose sum is σ = 731221913760. Its totient is φ = 224935955424.

The previous prime is 421806856349. The next prime is 421806856417. The reversal of 421806856365 is 563658608124.

421806856365 is a `hidden beast` number, since 4 + 2 + 18 + 0 + 6 + 8 + 563 + 65 = 666.

It is not a de Polignac number, because 421806856365 - 2⁴ = 421806856349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204967 + ... + 941076.

It is an arithmetic number, because the mean of its divisors is an integer number (30467579740).

Almost surely, 2^421806856365 is an apocalyptic number.

421806856365 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

421806856365 is a deficient number, since it is larger than the sum of its proper divisors (309415057395).

421806856365 is a wasteful number, since it uses less digits than its factorization.

421806856365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154233 (or 1154230 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 421806856365 in words is "four hundred twenty-one billion, eight hundred six million, eight hundred fifty-six thousand, three hundred sixty-five".