21220212211222 has 16 divisors (see below), whose sum is σ = 31861911117600. Its totient is φ = 10599577179840.

The previous prime is 21220212211171. The next prime is 21220212211223. The reversal of 21220212211222 is 22211221202212.

It is a junction number, because it is equal to n+sod(n) for n = 21220212211193 and 21220212211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220212211223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20866279 + ... + 21859597.

It is an arithmetic number, because the mean of its divisors is an integer number (1991369444850).

Almost surely, 2^{21220212211222} is an apocalyptic number.

21220212211222 is a deficient number, since it is larger than the sum of its proper divisors (10641698906378).

21220212211222 is a wasteful number, since it uses less digits than its factorization.

21220212211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003911.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21220212211222 its reverse (22211221202212), we get a palindrome (43431433413434).

The spelling of 21220212211222 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, two hundred eleven thousand, two hundred twenty-two".