221011221102121 has 4 divisors (see below), whose sum is σ = 221011322777172. Its totient is φ = 221011119427072.

The previous prime is 221011221102107. The next prime is 221011221102197. The reversal of 221011221102121 is 121201122110122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 168641104743721 + 52370116358400 = 12986189^2 + 7236720^2 .

It is a cyclic number.

It is not a de Polignac number, because 221011221102121 - 2¹⁷ = 221011220971049 is a prime.

It is a super-2 number, since 2×221011221102121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221011221102521) 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, 47504116 + ... + 51948661.

It is an arithmetic number, because the mean of its divisors is an integer number (55252830694293).

Almost surely, 2^{221011221102121} is an apocalyptic number.

It is an amenable number.

221011221102121 is a deficient number, since it is larger than the sum of its proper divisors (101675051).

221011221102121 is an equidigital number, since it uses as much as digits as its factorization.

221011221102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101675050.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221011221102121 its reverse (121201122110122), we get a palindrome (342212343212243).

The spelling of 221011221102121 in words is "two hundred twenty-one trillion, eleven billion, two hundred twenty-one million, one hundred two thousand, one hundred twenty-one".