221021201121 has 8 divisors (see below), whose sum is σ = 336794211264. Its totient is φ = 126297829200.

The previous prime is 221021201111. The next prime is 221021201153. The reversal of 221021201121 is 121102120122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221021201121 - 2²⁵ = 220987646689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221021201121.

It is not an unprimeable number, because it can be changed into a prime (221021201111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5262409530 + ... + 5262409571.

It is an arithmetic number, because the mean of its divisors is an integer number (42099276408).

Almost surely, 2^221021201121 is an apocalyptic number.

221021201121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221021201121 is a deficient number, since it is larger than the sum of its proper divisors (115773010143).

221021201121 is a wasteful number, since it uses less digits than its factorization.

221021201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10524819111.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221021201121 its reverse (121102120122), we get a palindrome (342123321243).

The spelling of 221021201121 in words is "two hundred twenty-one billion, twenty-one million, two hundred one thousand, one hundred twenty-one".