1242455050021 has 2 divisors, whose sum is σ = 1242455050022. Its totient is φ = 1242455050020.

The previous prime is 1242455050013. The next prime is 1242455050051. The reversal of 1242455050021 is 1200505542421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 910661769796 + 331793280225 = 954286^2 + 576015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242455050021 - 2³ = 1242455050013 is a prime.

It is a super-2 number, since 2×1242455050021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242455050051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621227525010 + 621227525011.

It is an arithmetic number, because the mean of its divisors is an integer number (621227525011).

Almost surely, 2^{1242455050021} is an apocalyptic number.

It is an amenable number.

1242455050021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242455050021 is an equidigital number, since it uses as much as digits as its factorization.

1242455050021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 1242455050021 in words is "one trillion, two hundred forty-two billion, four hundred fifty-five million, fifty thousand, twenty-one".