121200001221 has 8 divisors (see below), whose sum is σ = 174030771040. Its totient is φ = 74584616112.

The previous prime is 121200001211. The next prime is 121200001261. The reversal of 121200001221 is 122100002121.

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

It is not a de Polignac number, because 121200001221 - 2¹⁴ = 121199984837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121200001197 and 121200001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200001211) 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, 1553846131 + ... + 1553846208.

It is an arithmetic number, because the mean of its divisors is an integer number (21753846380).

Almost surely, 2^121200001221 is an apocalyptic number.

It is an amenable number.

121200001221 is a deficient number, since it is larger than the sum of its proper divisors (52830769819).

121200001221 is a wasteful number, since it uses less digits than its factorization.

121200001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107692355.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121200001221 its reverse (122100002121), we get a palindrome (243300003342).

The spelling of 121200001221 in words is "one hundred twenty-one billion, two hundred million, one thousand, two hundred twenty-one".