21442333132 has 48 divisors (see below), whose sum is σ = 41622626304. Its totient is φ = 9583616000.

The previous prime is 21442333127. The next prime is 21442333153. The reversal of 21442333132 is 23133324412.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21442333132.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1187532 + ... + 1205452.

It is an arithmetic number, because the mean of its divisors is an integer number (867138048).

Almost surely, 2^21442333132 is an apocalyptic number.

21442333132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21442333132 is a deficient number, since it is larger than the sum of its proper divisors (20180293172).

21442333132 is a wasteful number, since it uses less digits than its factorization.

21442333132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18390 (or 18388 counting only the distinct ones).

The product of its digits is 10368, while the sum is 28.

Adding to 21442333132 its reverse (23133324412), we get a palindrome (44575657544).

The spelling of 21442333132 in words is "twenty-one billion, four hundred forty-two million, three hundred thirty-three thousand, one hundred thirty-two".