121221022220100 has 216 divisors, whose sum is σ = 415967111213472. Its totient is φ = 29283073113600.

The previous prime is 121221022220047. The next prime is 121221022220117. The reversal of 121221022220100 is 1022220122121.

It is a happy number.

121221022220100 is a `hidden beast` number, since 1 + 21 + 221 + 0 + 222 + 201 + 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, 18831777 + ... + 24435176.

Almost surely, 2^{121221022220100} is an apocalyptic number.

121221022220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221022220100 is an abundant number, since it is smaller than the sum of its proper divisors (294746088993372).

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

121221022220100 is a wasteful number, since it uses less digits than its factorization.

121221022220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43267267 (or 43267257 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121221022220100 its reverse (1022220122121), we get a palindrome (122243242342221).

The spelling of 121221022220100 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty thousand, one hundred".