121220111220216 has 48 divisors (see below), whose sum is σ = 311462192354040. Its totient is φ = 39314630655360.

The previous prime is 121220111220199. The next prime is 121220111220217. The reversal of 121220111220216 is 612022111022121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220111220217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1844685175 + ... + 1844750886.

Almost surely, 2^{121220111220216} is an apocalyptic number.

It is an amenable number.

121220111220216 is an abundant number, since it is smaller than the sum of its proper divisors (190242081133824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121220111220216 is a wasteful number, since it uses less digits than its factorization.

121220111220216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3689436144 (or 3689436103 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

Adding to 121220111220216 its reverse (612022111022121), we get a palindrome (733242222242337).

The spelling of 121220111220216 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty thousand, two hundred sixteen".