1212220073 has 2 divisors, whose sum is σ = 1212220074. Its totient is φ = 1212220072.

The previous prime is 1212220033. The next prime is 1212220091. The reversal of 1212220073 is 3700222121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1053132304 + 159087769 = 32452^2 + 12613^2 .

It is an emirp because it is prime and its reverse (3700222121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212220073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212220033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110036 + 606110037.

It is an arithmetic number, because the mean of its divisors is an integer number (606110037).

Almost surely, 2^1212220073 is an apocalyptic number.

It is an amenable number.

1212220073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212220073 is an equidigital number, since it uses as much as digits as its factorization.

1212220073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 1212220073 is about 34816.9509434700. The cubic root of 1212220073 is about 1066.2535506452.

Adding to 1212220073 its reverse (3700222121), we get a palindrome (4912442194).

The spelling of 1212220073 in words is "one billion, two hundred twelve million, two hundred twenty thousand, seventy-three".