21222032652 has 72 divisors (see below), whose sum is σ = 54487889456. Its totient is φ = 6962972544.

The previous prime is 21222032647. The next prime is 21222032749. The reversal of 21222032652 is 25623022212.

21222032652 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 2 + 0 + 3 + 2 + 652 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4080918 + ... + 4086114.

Almost surely, 2^21222032652 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 21222032652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27243944728).

21222032652 is an abundant number, since it is smaller than the sum of its proper divisors (33265856804).

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

21222032652 is a wasteful number, since it uses less digits than its factorization.

21222032652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6967 (or 6962 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21222032652 its reverse (25623022212), we get a palindrome (46845054864).

The spelling of 21222032652 in words is "twenty-one billion, two hundred twenty-two million, thirty-two thousand, six hundred fifty-two".