22121110421 has 2 divisors, whose sum is σ = 22121110422. Its totient is φ = 22121110420.

The previous prime is 22121110393. The next prime is 22121110423. The reversal of 22121110421 is 12401112122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20992822321 + 1128288100 = 144889^2 + 33590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22121110421 is a prime.

Together with 22121110423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22121110421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121110423) 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 as a sum of consecutive naturals, namely, 11060555210 + 11060555211.

It is an arithmetic number, because the mean of its divisors is an integer number (11060555211).

Almost surely, 2^22121110421 is an apocalyptic number.

It is an amenable number.

22121110421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121110421 is an equidigital number, since it uses as much as digits as its factorization.

22121110421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22121110421 its reverse (12401112122), we get a palindrome (34522222543).

The spelling of 22121110421 in words is "twenty-two billion, one hundred twenty-one million, one hundred ten thousand, four hundred twenty-one".