221853377863 has 4 divisors (see below), whose sum is σ = 238919022328. Its totient is φ = 204787733400.

The previous prime is 221853377839. The next prime is 221853377929. The reversal of 221853377863 is 368773358122.

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 221853377863 - 2²⁹ = 221316506951 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 (221853377063) 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, 8532822213 + ... + 8532822238.

It is an arithmetic number, because the mean of its divisors is an integer number (59729755582).

Almost surely, 2^221853377863 is an apocalyptic number.

221853377863 is a deficient number, since it is larger than the sum of its proper divisors (17065644465).

221853377863 is a wasteful number, since it uses less digits than its factorization.

221853377863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17065644464.

The product of its digits is 10160640, while the sum is 55.

The spelling of 221853377863 in words is "two hundred twenty-one billion, eight hundred fifty-three million, three hundred seventy-seven thousand, eight hundred sixty-three".