1242204022421 has 2 divisors, whose sum is σ = 1242204022422. Its totient is φ = 1242204022420.

The previous prime is 1242204022393. The next prime is 1242204022447.

1242204022421 is nontrivially palindromic in base 10.

It is an a-pointer prime, because the next prime (1242204022447) can be obtained adding 1242204022421 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1027153872196 + 215050150225 = 1013486^2 + 463735^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1242204022421 - 2³⁰ = 1241130280597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242204022921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621102011210 + 621102011211.

It is an arithmetic number, because the mean of its divisors is an integer number (621102011211).

Almost surely, 2^{1242204022421} is an apocalyptic number.

It is an amenable number.

1242204022421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242204022421 is an equidigital number, since it uses as much as digits as its factorization.

1242204022421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4096, while the sum is 26.

The spelling of 1242204022421 in words is "one trillion, two hundred forty-two billion, two hundred four million, twenty-two thousand, four hundred twenty-one".