1242990379021 has 2 divisors, whose sum is σ = 1242990379022. Its totient is φ = 1242990379020.

The previous prime is 1242990378983. The next prime is 1242990379069. The reversal of 1242990379021 is 1209730992421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1233407926921 + 9582452100 = 1110589^2 + 97890^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242990379021 - 2¹⁵ = 1242990346253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242990370021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621495189510 + 621495189511.

It is an arithmetic number, because the mean of its divisors is an integer number (621495189511).

Almost surely, 2^{1242990379021} is an apocalyptic number.

It is an amenable number.

1242990379021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242990379021 is an equidigital number, since it uses as much as digits as its factorization.

1242990379021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 1242990379021 in words is "one trillion, two hundred forty-two billion, nine hundred ninety million, three hundred seventy-nine thousand, twenty-one".