21112032221 has 16 divisors (see below), whose sum is σ = 24419472000. Its totient is φ = 17878408128.

The previous prime is 21112032211. The next prime is 21112032223. The reversal of 21112032221 is 12223021112.

It is not a de Polignac number, because 21112032221 - 2¹⁸ = 21111770077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112032221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112032223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226646 + ... + 305928.

It is an arithmetic number, because the mean of its divisors is an integer number (1526217000).

Almost surely, 2^21112032221 is an apocalyptic number.

It is an amenable number.

21112032221 is a deficient number, since it is larger than the sum of its proper divisors (3307439779).

21112032221 is a wasteful number, since it uses less digits than its factorization.

21112032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79748.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21112032221 its reverse (12223021112), we get a palindrome (33335053333).

The spelling of 21112032221 in words is "twenty-one billion, one hundred twelve million, thirty-two thousand, two hundred twenty-one".