1242043321 has 2 divisors, whose sum is σ = 1242043322. Its totient is φ = 1242043320.

The previous prime is 1242043247. The next prime is 1242043379. The reversal of 1242043321 is 1233402421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1168272400 + 73770921 = 34180^2 + 8589^2 .

It is an emirp because it is prime and its reverse (1233402421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242043321 - 2¹⁷ = 1241912249 is a prime.

It is a super-2 number, since 2×1242043321² = 3085343222481418082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1242043292 and 1242043301.

It is not a weakly prime, because it can be changed into another prime (1242043391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621021660 + 621021661.

It is an arithmetic number, because the mean of its divisors is an integer number (621021661).

Almost surely, 2^1242043321 is an apocalyptic number.

It is an amenable number.

1242043321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242043321 is an equidigital number, since it uses as much as digits as its factorization.

1242043321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1242043321 is about 35242.6349894556. The cubic root of 1242043321 is about 1074.9268588420.

Adding to 1242043321 its reverse (1233402421), we get a palindrome (2475445742).

The spelling of 1242043321 in words is "one billion, two hundred forty-two million, forty-three thousand, three hundred twenty-one".