211221222330 has 64 divisors (see below), whose sum is σ = 520219179648. Its totient is φ = 54854077440.

The previous prime is 211221222263. The next prime is 211221222347. The reversal of 211221222330 is 33222122112.

It is a super-2 number, since 2×211221222330² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211221222297 and 211221222306.

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, 539982 + ... + 844998.

It is an arithmetic number, because the mean of its divisors is an integer number (8128424682).

Almost surely, 2^211221222330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211221222330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260109589824).

211221222330 is an abundant number, since it is smaller than the sum of its proper divisors (308997957318).

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

211221222330 is a wasteful number, since it uses less digits than its factorization.

211221222330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305631.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 211221222330 its reverse (33222122112), we get a palindrome (244443344442).

The spelling of 211221222330 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, three hundred thirty".