221113123021 has 16 divisors (see below), whose sum is σ = 262306800000. Its totient is φ = 182365581888.

The previous prime is 221113122961. The next prime is 221113123031. The reversal of 221113123021 is 120321311122.

It is a de Polignac number, because none of the positive numbers 2^k-221113123021 is a prime.

It is a super-3 number, since 3×221113123021³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221113123021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221113123031) 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, 1799271 + ... + 1918228.

It is an arithmetic number, because the mean of its divisors is an integer number (16394175000).

Almost surely, 2^221113123021 is an apocalyptic number.

It is an amenable number.

221113123021 is a deficient number, since it is larger than the sum of its proper divisors (41193676979).

221113123021 is a wasteful number, since it uses less digits than its factorization.

221113123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3717828.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 221113123021 its reverse (120321311122), we get a palindrome (341434434143).

The spelling of 221113123021 in words is "two hundred twenty-one billion, one hundred thirteen million, one hundred twenty-three thousand, twenty-one".