21022031232 has 96 divisors (see below), whose sum is σ = 60525270000. Its totient is φ = 7003616256.

The previous prime is 21022031231. The next prime is 21022031269. The reversal of 21022031232 is 23213022012.

21022031232 is a `hidden beast` number, since 210 + 220 + 3 + 1 + 232 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022031231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2932869 + ... + 2940027.

Almost surely, 2^21022031232 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 21022031232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30262635000).

21022031232 is an abundant number, since it is smaller than the sum of its proper divisors (39503238768).

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

21022031232 is a wasteful number, since it uses less digits than its factorization.

21022031232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9728 (or 9713 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21022031232 its reverse (23213022012), we get a palindrome (44235053244).

The spelling of 21022031232 in words is "twenty-one billion, twenty-two million, thirty-one thousand, two hundred thirty-two".