221101121121 has 4 divisors (see below), whose sum is σ = 294801494832. Its totient is φ = 147400747412.

The previous prime is 221101121089. The next prime is 221101121179. The reversal of 221101121121 is 121121101122.

It is a happy number.

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 not a de Polignac number, because 221101121121 - 2⁵ = 221101121089 is a prime.

It is a super-2 number, since 2×221101121121² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221101121121.

It is not an unprimeable number, because it can be changed into a prime (221101121921) 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, 36850186851 + ... + 36850186856.

It is an arithmetic number, because the mean of its divisors is an integer number (73700373708).

Almost surely, 2^221101121121 is an apocalyptic number.

It is an amenable number.

221101121121 is a deficient number, since it is larger than the sum of its proper divisors (73700373711).

221101121121 is an equidigital number, since it uses as much as digits as its factorization.

221101121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73700373710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221101121121 its reverse (121121101122), we get a palindrome (342222222243).

The spelling of 221101121121 in words is "two hundred twenty-one billion, one hundred one million, one hundred twenty-one thousand, one hundred twenty-one".