21331142124 has 24 divisors (see below), whose sum is σ = 49853877360. Its totient is φ = 7098778944.

The previous prime is 21331142117. The next prime is 21331142141. The reversal of 21331142124 is 42124113312.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21331142094 and 21331142103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1442559 + ... + 1457270.

It is an arithmetic number, because the mean of its divisors is an integer number (2077244890).

Almost surely, 2^21331142124 is an apocalyptic number.

It is an amenable number.

21331142124 is an abundant number, since it is smaller than the sum of its proper divisors (28522735236).

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

21331142124 is a wasteful number, since it uses less digits than its factorization.

21331142124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900449 (or 2900447 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

Adding to 21331142124 its reverse (42124113312), we get a palindrome (63455255436).

The spelling of 21331142124 in words is "twenty-one billion, three hundred thirty-one million, one hundred forty-two thousand, one hundred twenty-four".