221101221010121 has 4 divisors (see below), whose sum is σ = 221211166920144. Its totient is φ = 220991275100100.

The previous prime is 221101221010093. The next prime is 221101221010147. The reversal of 221101221010121 is 121010122101122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221101221010121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221101221010121.

It is not an unprimeable number, because it can be changed into a prime (221101221010151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54972951995 + ... + 54972956016.

It is an arithmetic number, because the mean of its divisors is an integer number (55302791730036).

Almost surely, 2^{221101221010121} is an apocalyptic number.

It is an amenable number.

221101221010121 is a deficient number, since it is larger than the sum of its proper divisors (109945910023).

221101221010121 is a wasteful number, since it uses less digits than its factorization.

221101221010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109945910022.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221101221010121 its reverse (121010122101122), we get a palindrome (342111343111243).

The spelling of 221101221010121 in words is "two hundred twenty-one trillion, one hundred one billion, two hundred twenty-one million, ten thousand, one hundred twenty-one".