221121021021 has 8 divisors (see below), whose sum is σ = 298380173280. Its totient is φ = 145637941392.

The previous prime is 221121020971. The next prime is 221121021029. The reversal of 221121021021 is 120120121122.

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

It is not a de Polignac number, because 221121021021 - 2¹⁰ = 221121019997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121021029) 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, 444017866 + ... + 444018363.

It is an arithmetic number, because the mean of its divisors is an integer number (37297521660).

Almost surely, 2^221121021021 is an apocalyptic number.

It is an amenable number.

221121021021 is a deficient number, since it is larger than the sum of its proper divisors (77259152259).

221121021021 is an equidigital number, since it uses as much as digits as its factorization.

221121021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888036315.

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

Adding to 221121021021 its reverse (120120121122), we get a palindrome (341241142143).

The spelling of 221121021021 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, twenty-one".