1221012733 has 2 divisors, whose sum is σ = 1221012734. Its totient is φ = 1221012732.

The previous prime is 1221012719. The next prime is 1221012739. The reversal of 1221012733 is 3372101221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 916091289 + 304921444 = 30267^2 + 17462^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221012733 - 2⁵ = 1221012701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221012739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610506366 + 610506367.

It is an arithmetic number, because the mean of its divisors is an integer number (610506367).

Almost surely, 2^1221012733 is an apocalyptic number.

It is an amenable number.

1221012733 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221012733 is an equidigital number, since it uses as much as digits as its factorization.

1221012733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 1221012733 is about 34942.9926165462. The cubic root of 1221012733 is about 1068.8253137628.

Adding to 1221012733 its reverse (3372101221), we get a palindrome (4593113954).

The spelling of 1221012733 in words is "one billion, two hundred twenty-one million, twelve thousand, seven hundred thirty-three".