121220111221884 has 72 divisors (see below), whose sum is σ = 306641859058080. Its totient is φ = 40377123840000.

The previous prime is 121220111221883. The next prime is 121220111221967. The reversal of 121220111221884 is 488122111022121.

121220111221884 is a `hidden beast` number, since 1 + 21 + 220 + 111 + 221 + 8 + 84 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220111221883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 560056084 + ... + 560272484.

It is an arithmetic number, because the mean of its divisors is an integer number (4258914709140).

Almost surely, 2^{121220111221884} is an apocalyptic number.

It is an amenable number.

121220111221884 is an abundant number, since it is smaller than the sum of its proper divisors (185421747836196).

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

121220111221884 is a wasteful number, since it uses less digits than its factorization.

121220111221884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227731 (or 227726 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The spelling of 121220111221884 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, eight hundred eighty-four".