22121220122021 has 2 divisors, whose sum is σ = 22121220122022. Its totient is φ = 22121220122020.

The previous prime is 22121220121999. The next prime is 22121220122047. The reversal of 22121220122021 is 12022102212122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19715029705921 + 2406190416100 = 4440161^2 + 1551190^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121220122021 - 2²² = 22121215927717 is a prime.

It is a super-2 number, since 2×22121220122021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22121220121984 and 22121220122002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121220127021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060610061010 + 11060610061011.

It is an arithmetic number, because the mean of its divisors is an integer number (11060610061011).

Almost surely, 2^{22121220122021} is an apocalyptic number.

It is an amenable number.

22121220122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121220122021 is an equidigital number, since it uses as much as digits as its factorization.

22121220122021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22121220122021 its reverse (12022102212122), we get a palindrome (34143322334143).

The spelling of 22121220122021 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, twenty-one".