421801655999 has 4 divisors (see below), whose sum is σ = 421803447360. Its totient is φ = 421799864640.

The previous prime is 421801655987. The next prime is 421801656007. The reversal of 421801655999 is 999556108124.

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 421801655999 - 2¹² = 421801651903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421801655399) 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, 477359 + ... + 1035120.

It is an arithmetic number, because the mean of its divisors is an integer number (105450861840).

Almost surely, 2^421801655999 is an apocalyptic number.

421801655999 is a deficient number, since it is larger than the sum of its proper divisors (1791361).

421801655999 is a wasteful number, since it uses less digits than its factorization.

421801655999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791360.

The product of its (nonzero) digits is 6998400, while the sum is 59.

The spelling of 421801655999 in words is "four hundred twenty-one billion, eight hundred one million, six hundred fifty-five thousand, nine hundred ninety-nine".