1242372712421 has 2 divisors, whose sum is σ = 1242372712422. Its totient is φ = 1242372712420.

The previous prime is 1242372712381. The next prime is 1242372712433. The reversal of 1242372712421 is 1242172732421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1071253980196 + 171118732225 = 1035014^2 + 413665^2 .

It is an emirp because it is prime and its reverse (1242172732421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242372712421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242372715421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621186356210 + 621186356211.

It is an arithmetic number, because the mean of its divisors is an integer number (621186356211).

Almost surely, 2^{1242372712421} is an apocalyptic number.

It is an amenable number.

1242372712421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242372712421 is an equidigital number, since it uses as much as digits as its factorization.

1242372712421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 38.

The spelling of 1242372712421 in words is "one trillion, two hundred forty-two billion, three hundred seventy-two million, seven hundred twelve thousand, four hundred twenty-one".