21120222032 has 120 divisors (see below), whose sum is σ = 50741127360. Its totient is φ = 8338636800.

The previous prime is 21120222023. The next prime is 21120222037. The reversal of 21120222032 is 23022202112.

It is a self number, because there is not a number n which added to its sum of digits gives 21120222032.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120222037) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14554907 + ... + 14556357.

It is an arithmetic number, because the mean of its divisors is an integer number (422842728).

Almost surely, 2^21120222032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120222032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25370563680).

21120222032 is an abundant number, since it is smaller than the sum of its proper divisors (29620905328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120222032 is a wasteful number, since it uses less digits than its factorization.

21120222032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261 (or 2242 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21120222032 its reverse (23022202112), we get a palindrome (44142424144).

The spelling of 21120222032 in words is "twenty-one billion, one hundred twenty million, two hundred twenty-two thousand, thirty-two".