21221101202222 has 16 divisors (see below), whose sum is σ = 31839144867360. Its totient is φ = 10608053103648.

The previous prime is 21221101202219. The next prime is 21221101202227. The reversal of 21221101202222 is 22220210112212.

It is a junction number, because it is equal to n+sod(n) for n = 21221101202194 and 21221101202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221101202227) 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, 463755368 + ... + 463801124.

It is an arithmetic number, because the mean of its divisors is an integer number (1989946554210).

Almost surely, 2^{21221101202222} is an apocalyptic number.

21221101202222 is a deficient number, since it is larger than the sum of its proper divisors (10618043665138).

21221101202222 is a wasteful number, since it uses less digits than its factorization.

21221101202222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95275.

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

Adding to 21221101202222 its reverse (22220210112212), we get a palindrome (43441311314434).

The spelling of 21221101202222 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred two thousand, two hundred twenty-two".