221221020330 has 48 divisors (see below), whose sum is σ = 575253773640. Its totient is φ = 58984157184.

The previous prime is 221221020329. The next prime is 221221020331. The reversal of 221221020330 is 33020122122.

221221020330 is a `hidden beast` number, since 221 + 2 + 210 + 203 + 30 = 666.

It is an interprime number because it is at equal distance from previous prime (221221020329) and next prime (221221020331).

It can be written as a sum of positive squares in 4 ways, for example, as 194605381881 + 26615638449 = 441141^2 + 163143^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221221020331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 503626 + ... + 834314.

Almost surely, 2^221221020330 is an apocalyptic number.

221221020330 is an abundant number, since it is smaller than the sum of its proper divisors (354032753310).

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

221221020330 is a wasteful number, since it uses less digits than its factorization.

221221020330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338135 (or 338132 counting only the distinct ones).

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

Adding to 221221020330 its reverse (33020122122), we get a palindrome (254241142452).

The spelling of 221221020330 in words is "two hundred twenty-one billion, two hundred twenty-one million, twenty thousand, three hundred thirty".