221021112021 has 16 divisors (see below), whose sum is σ = 304820717568. Its totient is φ = 142303820400.

The previous prime is 221021112001. The next prime is 221021112031. The reversal of 221021112021 is 120211120122.

It is not a de Polignac number, because 221021112021 - 2¹⁸ = 221020849877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021112001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2374471 + ... + 2465796.

It is an arithmetic number, because the mean of its divisors is an integer number (19051294848).

Almost surely, 2^221021112021 is an apocalyptic number.

It is an amenable number.

221021112021 is a deficient number, since it is larger than the sum of its proper divisors (83799605547).

221021112021 is a wasteful number, since it uses less digits than its factorization.

221021112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840792.

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

Adding to 221021112021 its reverse (120211120122), we get a palindrome (341232232143).

The spelling of 221021112021 in words is "two hundred twenty-one billion, twenty-one million, one hundred twelve thousand, twenty-one".