21203024124 has 48 divisors (see below), whose sum is σ = 49625856000. Its totient is φ = 7045976256.

The previous prime is 21203024093. The next prime is 21203024137. The reversal of 21203024124 is 42142030212.

It is a self number, because there is not a number n which added to its sum of digits gives 21203024124.

It is a congruent number.

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, 8837077 + ... + 8839475.

It is an arithmetic number, because the mean of its divisors is an integer number (1033872000).

Almost surely, 2^21203024124 is an apocalyptic number.

It is an amenable number.

21203024124 is an abundant number, since it is smaller than the sum of its proper divisors (28422831876).

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

21203024124 is a wasteful number, since it uses less digits than its factorization.

21203024124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4362 (or 4360 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21203024124 its reverse (42142030212), we get a palindrome (63345054336).

The spelling of 21203024124 in words is "twenty-one billion, two hundred three million, twenty-four thousand, one hundred twenty-four".