22122121022021 has 2 divisors, whose sum is σ = 22122121022022. Its totient is φ = 22122121022020.

The previous prime is 22122121022003. The next prime is 22122121022087. The reversal of 22122121022021 is 12022012122122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19826626344100 + 2295494677921 = 4452710^2 + 1515089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22122121022021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22122121021984 and 22122121022002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22122121022321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11061060511010 + 11061060511011.

It is an arithmetic number, because the mean of its divisors is an integer number (11061060511011).

Almost surely, 2^{22122121022021} is an apocalyptic number.

It is an amenable number.

22122121022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22122121022021 is an equidigital number, since it uses as much as digits as its factorization.

22122121022021 is an evil number, because the sum of its binary digits is even.

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

Adding to 22122121022021 its reverse (12022012122122), we get a palindrome (34144133144143).

The spelling of 22122121022021 in words is "twenty-two trillion, one hundred twenty-two billion, one hundred twenty-one million, twenty-two thousand, twenty-one".