21144322124 has 48 divisors (see below), whose sum is σ = 38835659520. Its totient is φ = 10059974400.

The previous prime is 21144322123. The next prime is 21144322151. The reversal of 21144322124 is 42122344112.

It is a junction number, because it is equal to n+sod(n) for n = 21144322093 and 21144322102.

It is not an unprimeable number, because it can be changed into a prime (21144322123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2608622 + ... + 2616714.

It is an arithmetic number, because the mean of its divisors is an integer number (809076240).

Almost surely, 2^21144322124 is an apocalyptic number.

It is an amenable number.

21144322124 is a deficient number, since it is larger than the sum of its proper divisors (17691337396).

21144322124 is a wasteful number, since it uses less digits than its factorization.

21144322124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8450 (or 8448 counting only the distinct ones).

The product of its digits is 3072, while the sum is 26.

Adding to 21144322124 its reverse (42122344112), we get a palindrome (63266666236).

The spelling of 21144322124 in words is "twenty-one billion, one hundred forty-four million, three hundred twenty-two thousand, one hundred twenty-four".