121021210100121 has 4 divisors (see below), whose sum is σ = 161361613466832. Its totient is φ = 80680806733412.

The previous prime is 121021210100111. The next prime is 121021210100207. The reversal of 121021210100121 is 121001012120121.

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 121021210100121 - 2²⁶ = 121021142991257 is a prime.

It is a super-2 number, since 2×121021210100121² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121021210100121.

It is not an unprimeable number, because it can be changed into a prime (121021210100111) 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, 20170201683351 + ... + 20170201683356.

It is an arithmetic number, because the mean of its divisors is an integer number (40340403366708).

Almost surely, 2^{121021210100121} is an apocalyptic number.

It is an amenable number.

121021210100121 is a deficient number, since it is larger than the sum of its proper divisors (40340403366711).

121021210100121 is an equidigital number, since it uses as much as digits as its factorization.

121021210100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40340403366710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121021210100121 its reverse (121001012120121), we get a palindrome (242022222220242).

The spelling of 121021210100121 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred ten million, one hundred thousand, one hundred twenty-one".