121221101042 has 16 divisors (see below), whose sum is σ = 190458829440. Its totient is φ = 57754864992.

The previous prime is 121221101041. The next prime is 121221101059. The reversal of 121221101042 is 240101122121.

It is a self number, because there is not a number n which added to its sum of digits gives 121221101042.

It is not an unprimeable number, because it can be changed into a prime (121221101041) 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, 4997867 + ... + 5022062.

It is an arithmetic number, because the mean of its divisors is an integer number (11903676840).

Almost surely, 2^121221101042 is an apocalyptic number.

121221101042 is a deficient number, since it is larger than the sum of its proper divisors (69237728398).

121221101042 is a wasteful number, since it uses less digits than its factorization.

121221101042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10020217.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121221101042 its reverse (240101122121), we get a palindrome (361322223163).

The spelling of 121221101042 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, forty-two".