21220243132 has 48 divisors (see below), whose sum is σ = 44278133760. Its totient is φ = 8785324800.

The previous prime is 21220243129. The next prime is 21220243133. The reversal of 21220243132 is 23134202212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220243133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434382 + ... + 480757.

It is an arithmetic number, because the mean of its divisors is an integer number (922461120).

Almost surely, 2^21220243132 is an apocalyptic number.

21220243132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21220243132 is an abundant number, since it is smaller than the sum of its proper divisors (23057890628).

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

21220243132 is a wasteful number, since it uses less digits than its factorization.

21220243132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915202 (or 915200 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21220243132 its reverse (23134202212), we get a palindrome (44354445344).

The spelling of 21220243132 in words is "twenty-one billion, two hundred twenty million, two hundred forty-three thousand, one hundred thirty-two".