21213221111222 has 64 divisors (see below), whose sum is σ = 38170713784320. Its totient is φ = 8654189090976.

The previous prime is 21213221111221. The next prime is 21213221111227. The reversal of 21213221111222 is 22211112231212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213221111221) 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, 437363 + ... + 6528225.

It is an arithmetic number, because the mean of its divisors is an integer number (596417402880).

Almost surely, 2^{21213221111222} is an apocalyptic number.

21213221111222 is a deficient number, since it is larger than the sum of its proper divisors (16957492673098).

21213221111222 is a wasteful number, since it uses less digits than its factorization.

21213221111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6091065.

The product of its digits is 384, while the sum is 23.

Adding to 21213221111222 its reverse (22211112231212), we get a palindrome (43424333342434).

The spelling of 21213221111222 in words is "twenty-one trillion, two hundred thirteen billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twenty-two".