121121022221100 has 216 divisors, whose sum is σ = 415289004469248. Its totient is φ = 29282663894400.

The previous prime is 121121022221099. The next prime is 121121022221189. The reversal of 121121022221100 is 1122220121121.

121121022221100 is a `hidden beast` number, since 1 + 21 + 1 + 210 + 222 + 211 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13034884 + ... + 20301483.

Almost surely, 2^{121121022221100} is an apocalyptic number.

121121022221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121022221100 is an abundant number, since it is smaller than the sum of its proper divisors (294167982248148).

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

121121022221100 is a wasteful number, since it uses less digits than its factorization.

121121022221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33336765 (or 33336755 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121121022221100 its reverse (1122220121121), we get a palindrome (122243242342221).

The spelling of 121121022221100 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, twenty-two million, two hundred twenty-one thousand, one hundred".