21122222121222 has 16 divisors (see below), whose sum is σ = 42350853426672. Its totient is φ = 7023005843040.

The previous prime is 21122222121197. The next prime is 21122222121229. The reversal of 21122222121222 is 22212122222112.

It is a happy number.

It is a super-2 number, since 2×21122222121222² (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 = 21122222121192 and 21122222121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122222121229) 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, 4433713429 + ... + 4433718192.

It is an arithmetic number, because the mean of its divisors is an integer number (2646928339167).

Almost surely, 2^{21122222121222} is an apocalyptic number.

21122222121222 is an abundant number, since it is smaller than the sum of its proper divisors (21228631305450).

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

21122222121222 is a wasteful number, since it uses less digits than its factorization.

21122222121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8867432023.

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

Adding to 21122222121222 its reverse (22212122222112), we get a palindrome (43334344343334).

The spelling of 21122222121222 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-two".