121221100011 has 16 divisors (see below), whose sum is σ = 178067363328. Its totient is φ = 72739932000.

The previous prime is 121221100003. The next prime is 121221100067. The reversal of 121221100011 is 110001122121.

It is not a de Polignac number, because 121221100011 - 2³ = 121221100003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121221100011.

It is not an unprimeable number, because it can be changed into a prime (121221101011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18181651 + ... + 18188316.

It is an arithmetic number, because the mean of its divisors is an integer number (11129210208).

Almost surely, 2^121221100011 is an apocalyptic number.

121221100011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121221100011 is a deficient number, since it is larger than the sum of its proper divisors (56846263317).

121221100011 is a wasteful number, since it uses less digits than its factorization.

121221100011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36370082.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121221100011 its reverse (110001122121), we get a palindrome (231222222132).

The spelling of 121221100011 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, eleven".