111222124421 has 2 divisors, whose sum is σ = 111222124422. Its totient is φ = 111222124420.

The previous prime is 111222124417. The next prime is 111222124423. The reversal of 111222124421 is 124421222111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92804920321 + 18417204100 = 304639^2 + 135710^2 .

It is a cyclic number.

It is not a de Polignac number, because 111222124421 - 2² = 111222124417 is a prime.

Together with 111222124423, 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 (111222124423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55611062210 + 55611062211.

It is an arithmetic number, because the mean of its divisors is an integer number (55611062211).

Almost surely, 2^111222124421 is an apocalyptic number.

It is an amenable number.

111222124421 is a deficient number, since it is larger than the sum of its proper divisors (1).

111222124421 is an equidigital number, since it uses as much as digits as its factorization.

111222124421 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 111222124421 its reverse (124421222111), we get a palindrome (235643346532).

The spelling of 111222124421 in words is "one hundred eleven billion, two hundred twenty-two million, one hundred twenty-four thousand, four hundred twenty-one".