21210220122222 has 16 divisors (see below), whose sum is σ = 42701370314112. Its totient is φ = 7023251695800.

The previous prime is 21210220122103. The next prime is 21210220122257. The reversal of 21210220122222 is 22222102201212.

It is a super-2 number, since 2×21210220122222² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11705418588 + ... + 11705420399.

It is an arithmetic number, because the mean of its divisors is an integer number (2668835644632).

Almost surely, 2^{21210220122222} is an apocalyptic number.

21210220122222 is an abundant number, since it is smaller than the sum of its proper divisors (21491150191890).

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

21210220122222 is a wasteful number, since it uses less digits than its factorization.

21210220122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23410839143.

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

Adding to 21210220122222 its reverse (22222102201212), we get a palindrome (43432322323434).

The spelling of 21210220122222 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, one hundred twenty-two thousand, two hundred twenty-two".