21211200221222 has 12 divisors (see below), whose sum is σ = 34972185489108. Its totient is φ = 9641454645900.

The previous prime is 21211200221221. The next prime is 21211200221287. The reversal of 21211200221222 is 22212200211212.

It is a junction number, because it is equal to n+sod(n) for n = 21211200221194 and 21211200221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211200221221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43824793604 + ... + 43824794087.

It is an arithmetic number, because the mean of its divisors is an integer number (2914348790759).

Almost surely, 2^{21211200221222} is an apocalyptic number.

21211200221222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21211200221222 is a deficient number, since it is larger than the sum of its proper divisors (13760985267886).

21211200221222 is a wasteful number, since it uses less digits than its factorization.

21211200221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87649587715 (or 87649587704 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21211200221222 its reverse (22212200211212), we get a palindrome (43423400432434).

The spelling of 21211200221222 in words is "twenty-one trillion, two hundred eleven billion, two hundred million, two hundred twenty-one thousand, two hundred twenty-two".