1242423301261 has 2 divisors, whose sum is σ = 1242423301262. Its totient is φ = 1242423301260.

The previous prime is 1242423301213. The next prime is 1242423301297. The reversal of 1242423301261 is 1621033242421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1180060725636 + 62362575625 = 1086306^2 + 249725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242423301261 - 2⁹ = 1242423300749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242423301211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621211650630 + 621211650631.

It is an arithmetic number, because the mean of its divisors is an integer number (621211650631).

Almost surely, 2^{1242423301261} is an apocalyptic number.

It is an amenable number.

1242423301261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242423301261 is an equidigital number, since it uses as much as digits as its factorization.

1242423301261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 1242423301261 its reverse (1621033242421), we get a palindrome (2863456543682).

The spelling of 1242423301261 in words is "one trillion, two hundred forty-two billion, four hundred twenty-three million, three hundred one thousand, two hundred sixty-one".