121220211213 has 6 divisors (see below), whose sum is σ = 175095860654. Its totient is φ = 80813474136.

The previous prime is 121220211199. The next prime is 121220211239. The reversal of 121220211213 is 312112022121.

121220211213 is a `hidden beast` number, since 1 + 21 + 220 + 211 + 213 = 666.

It can be written as a sum of positive squares in only one way, i.e., 70863504804 + 50356706409 = 266202^2 + 224403^2 .

It is not a de Polignac number, because 121220211213 - 2⁵ = 121220211181 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 (121220211253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6734456170 + ... + 6734456187.

Almost surely, 2^121220211213 is an apocalyptic number.

It is an amenable number.

121220211213 is a deficient number, since it is larger than the sum of its proper divisors (53875649441).

121220211213 is a wasteful number, since it uses less digits than its factorization.

121220211213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13468912363 (or 13468912360 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 121220211213 its reverse (312112022121), we get a palindrome (433332233334).

The spelling of 121220211213 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred eleven thousand, two hundred thirteen".