21220022232 has 24 divisors (see below), whose sum is σ = 57470893740. Its totient is φ = 7073340720.

The previous prime is 21220022231. The next prime is 21220022261. The reversal of 21220022232 is 23222002212.

21220022232 is a `hidden beast` number, since 212 + 200 + 22 + 232 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

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 (21220022231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147361194 + ... + 147361337.

Almost surely, 2^21220022232 is an apocalyptic number.

It is an amenable number.

21220022232 is an abundant number, since it is smaller than the sum of its proper divisors (36250871508).

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

21220022232 is a wasteful number, since it uses less digits than its factorization.

21220022232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294722543 (or 294722536 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21220022232 its reverse (23222002212), we get a palindrome (44442024444).

It can be divided in two parts, 212200 and 22232, that added together give a palindrome (234432).

The spelling of 21220022232 in words is "twenty-one billion, two hundred twenty million, twenty-two thousand, two hundred thirty-two".