1221131003101 has 4 divisors (see below), whose sum is σ = 1227267340000. Its totient is φ = 1214994666204.

The previous prime is 1221131003087. The next prime is 1221131003117. The reversal of 1221131003101 is 1013001311221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221131003101 - 2³³ = 1212541068509 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 (1221131003161) 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, 3068168151 + ... + 3068168548.

It is an arithmetic number, because the mean of its divisors is an integer number (306816835000).

Almost surely, 2^{1221131003101} is an apocalyptic number.

It is an amenable number.

1221131003101 is a deficient number, since it is larger than the sum of its proper divisors (6136336899).

1221131003101 is an equidigital number, since it uses as much as digits as its factorization.

1221131003101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6136336898.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1221131003101 its reverse (1013001311221), we get a palindrome (2234132314322).

The spelling of 1221131003101 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-one million, three thousand, one hundred one".