221853378228 has 48 divisors (see below), whose sum is σ = 541882736640. Its totient is φ = 70557631200.

The previous prime is 221853378209. The next prime is 221853378233. The reversal of 221853378228 is 822873358122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4173448 + ... + 4226271.

It is an arithmetic number, because the mean of its divisors is an integer number (11289223680).

Almost surely, 2^221853378228 is an apocalyptic number.

It is an amenable number.

221853378228 is an abundant number, since it is smaller than the sum of its proper divisors (320029358412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221853378228 is a wasteful number, since it uses less digits than its factorization.

221853378228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8399828 (or 8399826 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 51.

The spelling of 221853378228 in words is "two hundred twenty-one billion, eight hundred fifty-three million, three hundred seventy-eight thousand, two hundred twenty-eight".