221101212222 has 64 divisors (see below), whose sum is σ = 536290905600. Its totient is φ = 66964371840.

The previous prime is 221101212221. The next prime is 221101212223. The reversal of 221101212222 is 222212101122.

It is a happy number.

221101212222 is a `hidden beast` number, since 221 + 10 + 1 + 212 + 222 = 666.

It is an interprime number because it is at equal distance from previous prime (221101212221) and next prime (221101212223).

It is a super-3 number, since 3×221101212222³ (a number of 35 digits) contains 333 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 = 221101212195 and 221101212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101212221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1017078 + ... + 1215174.

It is an arithmetic number, because the mean of its divisors is an integer number (8379545400).

Almost surely, 2^221101212222 is an apocalyptic number.

221101212222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221101212222 is an abundant number, since it is smaller than the sum of its proper divisors (315189693378).

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

221101212222 is a wasteful number, since it uses less digits than its factorization.

221101212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199998 (or 199992 counting only the distinct ones).

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

Adding to 221101212222 its reverse (222212101122), we get a palindrome (443313313344).

Subtracting 221101212222 from its reverse (222212101122), we obtain a square (1110888900 = 33330²).

The spelling of 221101212222 in words is "two hundred twenty-one billion, one hundred one million, two hundred twelve thousand, two hundred twenty-two".