211221000111222 has 24 divisors (see below), whose sum is σ = 464476030097976. Its totient is φ = 69356149289856.

The previous prime is 211221000111217. The next prime is 211221000111229. The reversal of 211221000111222 is 222111000122112.

211221000111222 is a `hidden beast` number, since 211 + 22 + 100 + 0 + 111 + 222 = 666.

It is a super-2 number, since 2×211221000111222² (a number of 29 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 = 211221000111195 and 211221000111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221000111229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87570894363 + ... + 87570896774.

It is an arithmetic number, because the mean of its divisors is an integer number (19353167920749).

Almost surely, 2^{211221000111222} is an apocalyptic number.

211221000111222 is an abundant number, since it is smaller than the sum of its proper divisors (253255029986754).

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

211221000111222 is a wasteful number, since it uses less digits than its factorization.

211221000111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175141791212 (or 175141791209 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211221000111222 its reverse (222111000122112), we get a palindrome (433332000233334).

The spelling of 211221000111222 in words is "two hundred eleven trillion, two hundred twenty-one billion, one hundred eleven thousand, two hundred twenty-two".