1112121421 has 2 divisors, whose sum is σ = 1112121422. Its totient is φ = 1112121420.

The previous prime is 1112121407. The next prime is 1112121443. The reversal of 1112121421 is 1241212111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1031373225 + 80748196 = 32115^2 + 8986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1112121421 - 2⁵ = 1112121389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1112121395 and 1112121404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1112121401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556060710 + 556060711.

It is an arithmetic number, because the mean of its divisors is an integer number (556060711).

Almost surely, 2^1112121421 is an apocalyptic number.

It is an amenable number.

1112121421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1112121421 is an equidigital number, since it uses as much as digits as its factorization.

1112121421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32, while the sum is 16.

The square root of 1112121421 is about 33348.4845382815. The cubic root of 1112121421 is about 1036.0580003231.

Adding to 1112121421 its reverse (1241212111), we get a palindrome (2353333532).

The spelling of 1112121421 in words is "one billion, one hundred twelve million, one hundred twenty-one thousand, four hundred twenty-one".