1221133029923 has 2 divisors, whose sum is σ = 1221133029924. Its totient is φ = 1221133029922.

The previous prime is 1221133029899. The next prime is 1221133029937. The reversal of 1221133029923 is 3299203311221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221133029923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221133029323) 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, 610566514961 + 610566514962.

It is an arithmetic number, because the mean of its divisors is an integer number (610566514962).

Almost surely, 2^{1221133029923} is an apocalyptic number.

1221133029923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221133029923 is an equidigital number, since it uses as much as digits as its factorization.

1221133029923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The spelling of 1221133029923 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-three million, twenty-nine thousand, nine hundred twenty-three".