21211122022222 has 16 divisors (see below), whose sum is σ = 34709311652400. Its totient is φ = 9641362743040.

The previous prime is 21211122022201. The next prime is 21211122022249. The reversal of 21211122022222 is 22222022111212.

It is a super-2 number, since 2×21211122022222² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21211122022193 and 21211122022202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1155804 + ... + 6614992.

It is an arithmetic number, because the mean of its divisors is an integer number (2169331978275).

Almost surely, 2^{21211122022222} is an apocalyptic number.

21211122022222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21211122022222 is a deficient number, since it is larger than the sum of its proper divisors (13498189630178).

21211122022222 is a wasteful number, since it uses less digits than its factorization.

21211122022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5635811.

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

Adding to 21211122022222 its reverse (22222022111212), we get a palindrome (43433144133434).

The spelling of 21211122022222 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-two million, twenty-two thousand, two hundred twenty-two".