1242111411421 has 2 divisors, whose sum is σ = 1242111411422. Its totient is φ = 1242111411420.

The previous prime is 1242111411413. The next prime is 1242111411467. The reversal of 1242111411421 is 1241141112421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 830959864900 + 411151546521 = 911570^2 + 641211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242111411421 - 2³ = 1242111411413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242111411491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621055705710 + 621055705711.

It is an arithmetic number, because the mean of its divisors is an integer number (621055705711).

Almost surely, 2^{1242111411421} is an apocalyptic number.

It is an amenable number.

1242111411421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242111411421 is an equidigital number, since it uses as much as digits as its factorization.

1242111411421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 25.

Adding to 1242111411421 its reverse (1241141112421), we get a palindrome (2483252523842).

Subtracting from 1242111411421 its reverse (1241141112421), we obtain a cube (970299000 = 990³).

The spelling of 1242111411421 in words is "one trillion, two hundred forty-two billion, one hundred eleven million, four hundred eleven thousand, four hundred twenty-one".