21221122122222 has 32 divisors (see below), whose sum is σ = 46759052179584. Its totient is φ = 6366973332000.

The previous prime is 21221122122191. The next prime is 21221122122281. The reversal of 21221122122222 is 22222122112212.

It is a happy number.

It is a super-2 number, since 2×21221122122222² (a number of 27 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21221122122192 and 21221122122201.

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, 1591736668 + ... + 1591749999.

It is an arithmetic number, because the mean of its divisors is an integer number (1461220380612).

Almost surely, 2^{21221122122222} is an apocalyptic number.

21221122122222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221122122222 is an abundant number, since it is smaller than the sum of its proper divisors (25537930057362).

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

21221122122222 is a wasteful number, since it uses less digits than its factorization.

21221122122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183486784.

The product of its digits is 1024, while the sum is 24.

Adding to 21221122122222 its reverse (22222122112212), we get a palindrome (43443244234434).

The spelling of 21221122122222 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty-two".