121211220213 has 24 divisors (see below), whose sum is σ = 176464229760. Its totient is φ = 80170735680.

The previous prime is 121211220203. The next prime is 121211220223. The reversal of 121211220213 is 312022112121.

121211220213 is a `hidden beast` number, since 1 + 21 + 211 + 220 + 213 = 666.

It is an interprime number because it is at equal distance from previous prime (121211220203) and next prime (121211220223).

It is not a de Polignac number, because 121211220213 - 2²² = 121207025909 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211220203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1820020 + ... + 1885442.

It is an arithmetic number, because the mean of its divisors is an integer number (7352676240).

Almost surely, 2^121211220213 is an apocalyptic number.

It is an amenable number.

121211220213 is a deficient number, since it is larger than the sum of its proper divisors (55253009547).

121211220213 is a wasteful number, since it uses less digits than its factorization.

121211220213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67049 (or 67046 counting only the distinct ones).

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

Adding to 121211220213 its reverse (312022112121), we get a palindrome (433233332334).

The spelling of 121211220213 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred thirteen".