121220111221008 has 40 divisors (see below), whose sum is σ = 313154076716448. Its totient is φ = 40406429839872.

The previous prime is 121220111221007. The next prime is 121220111221031. The reversal of 121220111221008 is 800122111022121.

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

It is not an unprimeable number, because it can be changed into a prime (121220111221007) 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, 1341766 + ... + 15628197.

Almost surely, 2^{121220111221008} is an apocalyptic number.

It is an amenable number.

121220111221008 is an abundant number, since it is smaller than the sum of its proper divisors (191933965495440).

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

121220111221008 is a wasteful number, since it uses less digits than its factorization.

121220111221008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17118791 (or 17118785 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 24.

Adding to 121220111221008 its reverse (800122111022121), we get a palindrome (921342222243129).

The spelling of 121220111221008 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, eight".