1221221201303 has 16 divisors (see below), whose sum is σ = 1284559121760. Its totient is φ = 1159363497600.

The previous prime is 1221221201261. The next prime is 1221221201309. The reversal of 1221221201303 is 3031021221221.

It is not a de Polignac number, because 1221221201303 - 2⁸ = 1221221201047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221221201309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 470273 + ... + 1632053.

It is an arithmetic number, because the mean of its divisors is an integer number (80284945110).

Almost surely, 2^{1221221201303} is an apocalyptic number.

1221221201303 is a deficient number, since it is larger than the sum of its proper divisors (63337920457).

1221221201303 is a wasteful number, since it uses less digits than its factorization.

1221221201303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162418.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1221221201303 its reverse (3031021221221), we get a palindrome (4252242422524).

The spelling of 1221221201303 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, three hundred three".