1221331023301 has 4 divisors (see below), whose sum is σ = 1222717325004. Its totient is φ = 1219944721600.

The previous prime is 1221331023271. The next prime is 1221331023313. The reversal of 1221331023301 is 1033201331221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 707996030625 + 513334992676 = 841425^2 + 716474^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221331023301 - 2³¹ = 1219183539653 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 (1221331023371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693149530 + ... + 693151291.

It is an arithmetic number, because the mean of its divisors is an integer number (305679331251).

Almost surely, 2^{1221331023301} is an apocalyptic number.

It is an amenable number.

1221331023301 is a deficient number, since it is larger than the sum of its proper divisors (1386301703).

1221331023301 is an equidigital number, since it uses as much as digits as its factorization.

1221331023301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1386301702.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1221331023301 its reverse (1033201331221), we get a palindrome (2254532354522).

The spelling of 1221331023301 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, twenty-three thousand, three hundred one".