211221212220222 has 16 divisors (see below), whose sum is σ = 422446099200912. Its totient is φ = 70406458280000.

The previous prime is 211221212220199. The next prime is 211221212220241. The reversal of 211221212220222 is 222022212122112.

It is a happy number.

It is a super-2 number, since 2×211221212220222² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211221212220192 and 211221212220201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152367513 + ... + 153747524.

It is an arithmetic number, because the mean of its divisors is an integer number (26402881200057).

Almost surely, 2^{211221212220222} is an apocalyptic number.

211221212220222 is an abundant number, since it is smaller than the sum of its proper divisors (211224886980690).

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

211221212220222 is a wasteful number, since it uses less digits than its factorization.

211221212220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306230043.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 211221212220222 its reverse (222022212122112), we get a palindrome (433243424342334).

The spelling of 211221212220222 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, two hundred twenty-two".