21121212221122 has 16 divisors (see below), whose sum is σ = 34316100254520. Its totient is φ = 9691903516032.

The previous prime is 21121212221119. The next prime is 21121212221129. The reversal of 21121212221122 is 22112221212112.

It can be written as a sum of positive squares in 4 ways, for example, as 14668601261521 + 6452610959601 = 3829961^2 + 2540199^2 .

It is a super-2 number, since 2×21121212221122² (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 = 21121212221093 and 21121212221102.

It is not an unprimeable number, because it can be changed into a prime (21121212221129) 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, 2347840347 + ... + 2347849342.

Almost surely, 2^{21121212221122} is an apocalyptic number.

21121212221122 is a deficient number, since it is larger than the sum of its proper divisors (13194888033398).

21121212221122 is a wasteful number, since it uses less digits than its factorization.

21121212221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4695689877.

The product of its digits is 256, while the sum is 22.

Adding to 21121212221122 its reverse (22112221212112), we get a palindrome (43233433433234).

The spelling of 21121212221122 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred twenty-two".