221021033442 has 64 divisors (see below), whose sum is σ = 491723301888. Its totient is φ = 65667672000.

The previous prime is 221021033393. The next prime is 221021033459. The reversal of 221021033442 is 244330120122.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 717873 + ... + 978459.

It is an arithmetic number, because the mean of its divisors is an integer number (7683176592).

Almost surely, 2^221021033442 is an apocalyptic number.

221021033442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 221021033442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245861650944).

221021033442 is an abundant number, since it is smaller than the sum of its proper divisors (270702268446).

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

221021033442 is a wasteful number, since it uses less digits than its factorization.

221021033442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260855.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 221021033442 its reverse (244330120122), we get a palindrome (465351153564).

The spelling of 221021033442 in words is "two hundred twenty-one billion, twenty-one million, thirty-three thousand, four hundred forty-two".