121221111101 has 16 divisors (see below), whose sum is σ = 130619596800. Its totient is φ = 112126554288.

The previous prime is 121221111097. The next prime is 121221111127. The reversal of 121221111101 is 101111122121.

It is a cyclic number.

It is not a de Polignac number, because 121221111101 - 2² = 121221111097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221111131) 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, 2167670 + ... + 2222888.

It is an arithmetic number, because the mean of its divisors is an integer number (8163724800).

Almost surely, 2^121221111101 is an apocalyptic number.

It is an amenable number.

121221111101 is a deficient number, since it is larger than the sum of its proper divisors (9398485699).

121221111101 is a wasteful number, since it uses less digits than its factorization.

121221111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57968.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121221111101 its reverse (101111122121), we get a palindrome (222332233222).

The spelling of 121221111101 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, one hundred one".