221221120192 has 56 divisors (see below), whose sum is σ = 445135442976. Its totient is φ = 109061941248.

The previous prime is 221221120189. The next prime is 221221120199. The reversal of 221221120192 is 291021122122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221221120199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23201058 + ... + 23210590.

It is an arithmetic number, because the mean of its divisors is an integer number (7948847196).

Almost surely, 2^221221120192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221221120192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222567721488).

221221120192 is an abundant number, since it is smaller than the sum of its proper divisors (223914322784).

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

221221120192 is an equidigital number, since it uses as much as digits as its factorization.

221221120192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14585 (or 14575 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 221221120192 in words is "two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred ninety-two".