221102022121 has 4 divisors (see below), whose sum is σ = 225806320512. Its totient is φ = 216397723732.

The previous prime is 221102022109. The next prime is 221102022137. The reversal of 221102022121 is 121220201122.

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 221102022121 - 2¹⁹ = 221101497833 is a prime.

It is a super-2 number, since 2×221102022121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221102022095 and 221102022104.

It is not an unprimeable number, because it can be changed into a prime (221102022221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2352149125 + ... + 2352149218.

It is an arithmetic number, because the mean of its divisors is an integer number (56451580128).

Almost surely, 2^221102022121 is an apocalyptic number.

It is an amenable number.

221102022121 is a deficient number, since it is larger than the sum of its proper divisors (4704298391).

221102022121 is an equidigital number, since it uses as much as digits as its factorization.

221102022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704298390.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221102022121 its reverse (121220201122), we get a palindrome (342322223243).

The spelling of 221102022121 in words is "two hundred twenty-one billion, one hundred two million, twenty-two thousand, one hundred twenty-one".