21101222202222 has 32 divisors (see below), whose sum is σ = 42221946703104. Its totient is φ = 7030491019200.

The previous prime is 21101222202187. The next prime is 21101222202293. The reversal of 21101222202222 is 22220222210112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134460522 + ... + 134617362.

It is an arithmetic number, because the mean of its divisors is an integer number (1319435834472).

Almost surely, 2^{21101222202222} is an apocalyptic number.

21101222202222 is an abundant number, since it is smaller than the sum of its proper divisors (21120724500882).

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

21101222202222 is a wasteful number, since it uses less digits than its factorization.

21101222202222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167064.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21101222202222 its reverse (22220222210112), we get a palindrome (43321444412334).

The spelling of 21101222202222 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-two million, two hundred two thousand, two hundred twenty-two".