13101121121221 has 4 divisors (see below), whose sum is σ = 14972709852832. Its totient is φ = 11229532389612.

The previous prime is 13101121121201. The next prime is 13101121121287. The reversal of 13101121121221 is 12212112110131.

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 13101121121221 - 2²⁵ = 13101087566789 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 (13101121121201) 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, 935794365795 + ... + 935794365808.

It is an arithmetic number, because the mean of its divisors is an integer number (3743177463208).

Almost surely, 2^{13101121121221} is an apocalyptic number.

It is an amenable number.

13101121121221 is a deficient number, since it is larger than the sum of its proper divisors (1871588731611).

13101121121221 is an equidigital number, since it uses as much as digits as its factorization.

13101121121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871588731610.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 13101121121221 its reverse (12212112110131), we get a palindrome (25313233231352).

The spelling of 13101121121221 in words is "thirteen trillion, one hundred one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".