211221212222222 has 4 divisors (see below), whose sum is σ = 316831818333336. Its totient is φ = 105610606111110.

The previous prime is 211221212222221. The next prime is 211221212222257. The reversal of 211221212222222 is 222222212122112.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×211221212222222² (a number of 29 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 211221212222191 and 211221212222200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221212222221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52805303055554 + ... + 52805303055557.

It is an arithmetic number, because the mean of its divisors is an integer number (79207954583334).

Almost surely, 2^{211221212222222} is an apocalyptic number.

211221212222222 is a deficient number, since it is larger than the sum of its proper divisors (105610606111114).

211221212222222 is a wasteful number, since it uses less digits than its factorization.

211221212222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105610606111113.

The product of its digits is 2048, while the sum is 26.

Adding to 211221212222222 its reverse (222222212122112), we get a palindrome (433443424344334).

The spelling of 211221212222222 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-two".