211221201222 has 48 divisors (see below), whose sum is σ = 466664653728. Its totient is φ = 69033110400.

The previous prime is 211221201173. The next prime is 211221201259. The reversal of 211221201222 is 222102122112.

It is a happy number.

211221201222 is a `hidden beast` number, since 21 + 1 + 221 + 201 + 222 = 666.

It is a super-2 number, since 2×211221201222² (a number of 23 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 211221201195 and 211221201204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 376743 + ... + 751250.

It is an arithmetic number, because the mean of its divisors is an integer number (9722180286).

Almost surely, 2^211221201222 is an apocalyptic number.

211221201222 is an abundant number, since it is smaller than the sum of its proper divisors (255443452506).

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

211221201222 is a wasteful number, since it uses less digits than its factorization.

211221201222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128205 (or 1128202 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211221201222 its reverse (222102122112), we get a palindrome (433323323334).

The spelling of 211221201222 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-two".