221021020332 has 216 divisors, whose sum is σ = 674606696400. Its totient is φ = 63089953920.

The previous prime is 221021020309. The next prime is 221021020349. The reversal of 221021020332 is 233020120122.

221021020332 is a `hidden beast` number, since 221 + 0 + 210 + 203 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 92825782 + ... + 92828162.

It is an arithmetic number, because the mean of its divisors is an integer number (3123179150).

Almost surely, 2^221021020332 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 221021020332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (337303348200).

221021020332 is an abundant number, since it is smaller than the sum of its proper divisors (453585676068).

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

221021020332 is a wasteful number, since it uses less digits than its factorization.

221021020332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363 (or 4342 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 221021020332 its reverse (233020120122), we get a palindrome (454041140454).

The spelling of 221021020332 in words is "two hundred twenty-one billion, twenty-one million, twenty thousand, three hundred thirty-two".