21124100024 has 16 divisors (see below), whose sum is σ = 39617143200. Its totient is φ = 10559528512.

The previous prime is 21124099963. The next prime is 21124100027. The reversal of 21124100024 is 42000142112.

It is a junction number, because it is equal to n+sod(n) for n = 21124099975 and 21124100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124100027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279344 + ... + 346815.

It is an arithmetic number, because the mean of its divisors is an integer number (2476071450).

Almost surely, 2^21124100024 is an apocalyptic number.

It is an amenable number.

21124100024 is a deficient number, since it is larger than the sum of its proper divisors (18493043176).

21124100024 is a wasteful number, since it uses less digits than its factorization.

21124100024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630382 (or 630378 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21124100024 its reverse (42000142112), we get a palindrome (63124242136).

The spelling of 21124100024 in words is "twenty-one billion, one hundred twenty-four million, one hundred thousand, twenty-four".