1242102350221 has 2 divisors, whose sum is σ = 1242102350222. Its totient is φ = 1242102350220.

The previous prime is 1242102350129. The next prime is 1242102350243. The reversal of 1242102350221 is 1220532012421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1206328788900 + 35773561321 = 1098330^2 + 189139^2 .

It is an emirp because it is prime and its reverse (1220532012421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242102350221 - 2¹⁹ = 1242101825933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242102360221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621051175110 + 621051175111.

It is an arithmetic number, because the mean of its divisors is an integer number (621051175111).

Almost surely, 2^{1242102350221} is an apocalyptic number.

It is an amenable number.

1242102350221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242102350221 is an equidigital number, since it uses as much as digits as its factorization.

1242102350221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 1242102350221 its reverse (1220532012421), we get a palindrome (2462634362642).

The spelling of 1242102350221 in words is "one trillion, two hundred forty-two billion, one hundred two million, three hundred fifty thousand, two hundred twenty-one".