1242120023 has 2 divisors, whose sum is σ = 1242120024. Its totient is φ = 1242120022.

The previous prime is 1242120001. The next prime is 1242120029. The reversal of 1242120023 is 3200212421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1242120023 - 2²² = 1237925719 is a prime.

It is a super-3 number, since 3×1242120023³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1242119983 and 1242120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242120029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621060011 + 621060012.

It is an arithmetic number, because the mean of its divisors is an integer number (621060012).

Almost surely, 2^1242120023 is an apocalyptic number.

1242120023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242120023 is an equidigital number, since it uses as much as digits as its factorization.

1242120023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1242120023 is about 35243.7231716514. The cubic root of 1242120023 is about 1074.9489856448.

Adding to 1242120023 its reverse (3200212421), we get a palindrome (4442332444).

The spelling of 1242120023 in words is "one billion, two hundred forty-two million, one hundred twenty thousand, twenty-three".