22021222212121 has 12 divisors (see below), whose sum is σ = 24276970477396. Its totient is φ = 19959888453120.

The previous prime is 22021222212113. The next prime is 22021222212229. The reversal of 22021222212121 is 12121222212022.

It can be written as a sum of positive squares in 2 ways, for example, as 1773787130896 + 20247435081225 = 1331836^2 + 4499715^2 .

It is not a de Polignac number, because 22021222212121 - 2³ = 22021222212113 is a prime.

It is a super-2 number, since 2×22021222212121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22021222212092 and 22021222212101.

It is not an unprimeable number, because it can be changed into a prime (22021222272121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 269979360 + ... + 270060913.

Almost surely, 2^{22021222212121} is an apocalyptic number.

It is an amenable number.

22021222212121 is a deficient number, since it is larger than the sum of its proper divisors (2255748265275).

22021222212121 is a wasteful number, since it uses less digits than its factorization.

22021222212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540040632 (or 540040621 counting only the distinct ones).

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

Adding to 22021222212121 its reverse (12121222212022), we get a palindrome (34142444424143).

Subtracting from 22021222212121 its reverse (12121222212022), we obtain a palindrome (9900000000099).

The spelling of 22021222212121 in words is "twenty-two trillion, twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".