1242514021 has 6 divisors (see below), whose sum is σ = 1445373510. Its totient is φ = 1065011976.

The previous prime is 1242513997. The next prime is 1242514051. The reversal of 1242514021 is 1204152421.

It can be written as a sum of positive squares in only one way, i.e., 865183396 + 377330625 = 29414^2 + 19425^2 .

It is not a de Polignac number, because 1242514021 - 2¹⁹ = 1241989733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242513983 and 1242514001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242514051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12678666 + ... + 12678763.

It is an arithmetic number, because the mean of its divisors is an integer number (240895585).

Almost surely, 2^1242514021 is an apocalyptic number.

It is an amenable number.

1242514021 is a deficient number, since it is larger than the sum of its proper divisors (202859489).

1242514021 is an equidigital number, since it uses as much as digits as its factorization.

1242514021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25357443 (or 25357436 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1242514021 is about 35249.3123479026. The cubic root of 1242514021 is about 1075.0626308561.

Adding to 1242514021 its reverse (1204152421), we get a palindrome (2446666442).

The spelling of 1242514021 in words is "one billion, two hundred forty-two million, five hundred fourteen thousand, twenty-one".