221120200121 has 4 divisors (see below), whose sum is σ = 221121158544. Its totient is φ = 221119241700.

The previous prime is 221120200061. The next prime is 221120200127. The reversal of 221120200121 is 121002021122.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121002021122 = 2 ⋅60501010561.

It is a cyclic number.

It is not a de Polignac number, because 221120200121 - 2³⁰ = 220046458297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221120200096 and 221120200105.

It is not an unprimeable number, because it can be changed into a prime (221120200127) 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, 101126 + ... + 672656.

It is an arithmetic number, because the mean of its divisors is an integer number (55280289636).

Almost surely, 2^221120200121 is an apocalyptic number.

It is an amenable number.

221120200121 is a deficient number, since it is larger than the sum of its proper divisors (958423).

221120200121 is an equidigital number, since it uses as much as digits as its factorization.

221120200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958422.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221120200121 its reverse (121002021122), we get a palindrome (342122221243).

The spelling of 221120200121 in words is "two hundred twenty-one billion, one hundred twenty million, two hundred thousand, one hundred twenty-one".