1221252563323 has 4 divisors (see below), whose sum is σ = 1315195068208. Its totient is φ = 1127310058440.

The previous prime is 1221252563303. The next prime is 1221252563341. The reversal of 1221252563323 is 3233652521221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221252563323 - 2⁹ = 1221252562811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221252563303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46971252423 + ... + 46971252448.

It is an arithmetic number, because the mean of its divisors is an integer number (328798767052).

Almost surely, 2^{1221252563323} is an apocalyptic number.

1221252563323 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221252563323 is a deficient number, since it is larger than the sum of its proper divisors (93942504885).

1221252563323 is an equidigital number, since it uses as much as digits as its factorization.

1221252563323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93942504884.

The product of its digits is 129600, while the sum is 37.

The spelling of 1221252563323 in words is "one trillion, two hundred twenty-one billion, two hundred fifty-two million, five hundred sixty-three thousand, three hundred twenty-three".