421830818867 has 4 divisors (see below), whose sum is σ = 423641251800. Its totient is φ = 420020385936.

The previous prime is 421830818863. The next prime is 421830818879. The reversal of 421830818867 is 768818038124.

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

It is a cyclic number.

It is not a de Polignac number, because 421830818867 - 2² = 421830818863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421830818863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 905216117 + ... + 905216582.

It is an arithmetic number, because the mean of its divisors is an integer number (105910312950).

Almost surely, 2^421830818867 is an apocalyptic number.

421830818867 is a deficient number, since it is larger than the sum of its proper divisors (1810432933).

421830818867 is a wasteful number, since it uses less digits than its factorization.

421830818867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810432932.

The product of its (nonzero) digits is 4128768, while the sum is 56.

The spelling of 421830818867 in words is "four hundred twenty-one billion, eight hundred thirty million, eight hundred eighteen thousand, eight hundred sixty-seven".