1222121122421 has 2 divisors, whose sum is σ = 1222121122422. Its totient is φ = 1222121122420.

The previous prime is 1222121122381. The next prime is 1222121122423. The reversal of 1222121122421 is 1242211212221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1052409256900 + 169711865521 = 1025870^2 + 411961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222121122421 - 2³⁴ = 1204941253237 is a prime.

Together with 1222121122423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222121122423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611060561210 + 611060561211.

It is an arithmetic number, because the mean of its divisors is an integer number (611060561211).

Almost surely, 2^{1222121122421} is an apocalyptic number.

It is an amenable number.

1222121122421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222121122421 is an equidigital number, since it uses as much as digits as its factorization.

1222121122421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 23.

Adding to 1222121122421 its reverse (1242211212221), we get a palindrome (2464332334642).

The spelling of 1222121122421 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-one million, one hundred twenty-two thousand, four hundred twenty-one".