221101100121 has 16 divisors (see below), whose sum is σ = 323574624000. Its totient is φ = 133178573520.

The previous prime is 221101100117. The next prime is 221101100159. The reversal of 221101100121 is 121001101122.

It is not a de Polignac number, because 221101100121 - 2² = 221101100117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221101100097 and 221101100106.

It is not an unprimeable number, because it can be changed into a prime (221101150121) 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, 20546871 + ... + 20557628.

It is an arithmetic number, because the mean of its divisors is an integer number (20223414000).

Almost surely, 2^221101100121 is an apocalyptic number.

It is an amenable number.

221101100121 is a deficient number, since it is larger than the sum of its proper divisors (102473523879).

221101100121 is a wasteful number, since it uses less digits than its factorization.

221101100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41104676.

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

Adding to 221101100121 its reverse (121001101122), we get a palindrome (342102201243).

The spelling of 221101100121 in words is "two hundred twenty-one billion, one hundred one million, one hundred thousand, one hundred twenty-one".