121213101 has 4 divisors (see below), whose sum is σ = 161617472. Its totient is φ = 80808732.

The previous prime is 121213063. The next prime is 121213129. The reversal of 121213101 is 101312121.

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 not a de Polignac number, because 121213101 - 2¹⁸ = 120950957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121213201) 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, 20202181 + ... + 20202186.

It is an arithmetic number, because the mean of its divisors is an integer number (40404368).

Almost surely, 2^121213101 is an apocalyptic number.

It is an amenable number.

121213101 is a deficient number, since it is larger than the sum of its proper divisors (40404371).

121213101 is an equidigital number, since it uses as much as digits as its factorization.

121213101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40404370.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 121213101 is about 11009.6821480005. The cubic root of 121213101 is about 494.8989366167.

Adding to 121213101 its reverse (101312121), we get a palindrome (222525222).

The spelling of 121213101 in words is "one hundred twenty-one million, two hundred thirteen thousand, one hundred one".