221211100121 has 16 divisors (see below), whose sum is σ = 242335387008. Its totient is φ = 200257123200.

The previous prime is 221211100069. The next prime is 221211100133. The reversal of 221211100121 is 121001112122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221211100121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221211100096 and 221211100105.

It is not an unprimeable number, because it can be changed into a prime (221211100151) 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, 3502595 + ... + 3565191.

It is an arithmetic number, because the mean of its divisors is an integer number (15145961688).

Almost surely, 2^221211100121 is an apocalyptic number.

It is an amenable number.

221211100121 is a deficient number, since it is larger than the sum of its proper divisors (21124286887).

221211100121 is a wasteful number, since it uses less digits than its factorization.

221211100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63952.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221211100121 its reverse (121001112122), we get a palindrome (342212212243).

The spelling of 221211100121 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred thousand, one hundred twenty-one".