221121021084 has 96 divisors (see below), whose sum is σ = 552554956800. Its totient is φ = 68670094080.

The previous prime is 221121021083. The next prime is 221121021131. The reversal of 221121021084 is 480120121122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121021083) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3713902 + ... + 3772970.

It is an arithmetic number, because the mean of its divisors is an integer number (5755780800).

Almost surely, 2^221121021084 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 221121021084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276277478400).

221121021084 is an abundant number, since it is smaller than the sum of its proper divisors (331433935716).

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

221121021084 is a wasteful number, since it uses less digits than its factorization.

221121021084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59483 (or 59481 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The spelling of 221121021084 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, eighty-four".