1242220433 has 2 divisors, whose sum is σ = 1242220434. Its totient is φ = 1242220432.

The previous prime is 1242220429. The next prime is 1242220453. The reversal of 1242220433 is 3340222421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1019971969 + 222248464 = 31937^2 + 14908^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242220433 - 2² = 1242220429 is a prime.

It is a super-2 number, since 2×1242220433² = 3086223208325414978, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1242220399 and 1242220408.

It is not a weakly prime, because it can be changed into another prime (1242220403) 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 as a sum of consecutive naturals, namely, 621110216 + 621110217.

It is an arithmetic number, because the mean of its divisors is an integer number (621110217).

Almost surely, 2^1242220433 is an apocalyptic number.

It is an amenable number.

1242220433 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242220433 is an equidigital number, since it uses as much as digits as its factorization.

1242220433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 1242220433 is about 35245.1476518400. The cubic root of 1242220433 is about 1074.9779502959.

Adding to 1242220433 its reverse (3340222421), we get a palindrome (4582442854).

The spelling of 1242220433 in words is "one billion, two hundred forty-two million, two hundred twenty thousand, four hundred thirty-three".