121021310131221 has 16 divisors (see below), whose sum is σ = 161576350423488. Its totient is φ = 80573574998400.

The previous prime is 121021310131199. The next prime is 121021310131237. The reversal of 121021310131221 is 122131013120121.

It is not a de Polignac number, because 121021310131221 - 2²⁵ = 121021276576789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021310131921) 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, 156220566 + ... + 156993336.

It is an arithmetic number, because the mean of its divisors is an integer number (10098521901468).

Almost surely, 2^{121021310131221} is an apocalyptic number.

It is an amenable number.

121021310131221 is a deficient number, since it is larger than the sum of its proper divisors (40555040292267).

121021310131221 is an equidigital number, since it uses as much as digits as its factorization.

121021310131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842132.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 121021310131221 its reverse (122131013120121), we get a palindrome (243152323251342).

The spelling of 121021310131221 in words is "one hundred twenty-one trillion, twenty-one billion, three hundred ten million, one hundred thirty-one thousand, two hundred twenty-one".