1221042021303 has 16 divisors (see below), whose sum is σ = 1754651374560. Its totient is φ = 750827503104.

The previous prime is 1221042021289. The next prime is 1221042021347. The reversal of 1221042021303 is 3031202401221.

It is not a de Polignac number, because 1221042021303 - 2²⁶ = 1220974912439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221042021303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221042021383) 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, 12094326 + ... + 12194867.

It is an arithmetic number, because the mean of its divisors is an integer number (109665710910).

Almost surely, 2^{1221042021303} is an apocalyptic number.

1221042021303 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221042021303 is a deficient number, since it is larger than the sum of its proper divisors (533609353257).

1221042021303 is a wasteful number, since it uses less digits than its factorization.

1221042021303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24290498.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1221042021303 its reverse (3031202401221), we get a palindrome (4252244422524).

The spelling of 1221042021303 in words is "one trillion, two hundred twenty-one billion, forty-two million, twenty-one thousand, three hundred three".