22121021999 has 2 divisors, whose sum is σ = 22121022000. Its totient is φ = 22121021998.

The previous prime is 22121021963. The next prime is 22121022019. The reversal of 22121021999 is 99912012122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22121021999 - 2¹⁶ = 22120956463 is a prime.

It is a super-2 number, since 2×22121021999² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121021929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060510999 + 11060511000.

It is an arithmetic number, because the mean of its divisors is an integer number (11060511000).

Almost surely, 2^22121021999 is an apocalyptic number.

22121021999 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121021999 is an equidigital number, since it uses as much as digits as its factorization.

22121021999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 22121021999 in words is "twenty-two billion, one hundred twenty-one million, twenty-one thousand, nine hundred ninety-nine".