221211111330 has 384 divisors, whose sum is σ = 686104473600. Its totient is φ = 48869222400.

The previous prime is 221211111313. The next prime is 221211111371. The reversal of 221211111330 is 33111112122.

221211111330 is a `hidden beast` number, since 2 + 212 + 11 + 111 + 330 = 666.

221211111330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 52158010 + ... + 52162250.

It is an arithmetic number, because the mean of its divisors is an integer number (1786730400).

Almost surely, 2^221211111330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221211111330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343052236800).

221211111330 is an abundant number, since it is smaller than the sum of its proper divisors (464893362270).

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

221211111330 is a wasteful number, since it uses less digits than its factorization.

221211111330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4390 (or 4387 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 221211111330 its reverse (33111112122), we get a palindrome (254322223452).

The spelling of 221211111330 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, three hundred thirty".