121200212121 has 8 divisors (see below), whose sum is σ = 162244109664. Its totient is φ = 80478228000.

The previous prime is 121200212117. The next prime is 121200212219. The reversal of 121200212121 is 121212002121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121200212121 - 2² = 121200212117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121200212121.

It is not an unprimeable number, because it can be changed into a prime (121200212921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80477476 + ... + 80478981.

It is an arithmetic number, because the mean of its divisors is an integer number (20280513708).

Almost surely, 2^121200212121 is an apocalyptic number.

It is an amenable number.

121200212121 is a deficient number, since it is larger than the sum of its proper divisors (41043897543).

121200212121 is a wasteful number, since it uses less digits than its factorization.

121200212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160956711.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121200212121 its reverse (121212002121), we get a palindrome (242412214242).

The spelling of 121200212121 in words is "one hundred twenty-one billion, two hundred million, two hundred twelve thousand, one hundred twenty-one".