1221300321523 has 2 divisors, whose sum is σ = 1221300321524. Its totient is φ = 1221300321522.

The previous prime is 1221300321503. The next prime is 1221300321541. The reversal of 1221300321523 is 3251230031221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221300321523 - 2²¹ = 1221298224371 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221300321503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610650160761 + 610650160762.

It is an arithmetic number, because the mean of its divisors is an integer number (610650160762).

Almost surely, 2^{1221300321523} is an apocalyptic number.

1221300321523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221300321523 is an equidigital number, since it uses as much as digits as its factorization.

1221300321523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 1221300321523 its reverse (3251230031221), we get a palindrome (4472530352744).

The spelling of 1221300321523 in words is "one trillion, two hundred twenty-one billion, three hundred million, three hundred twenty-one thousand, five hundred twenty-three".