21203254524 has 24 divisors (see below), whose sum is σ = 49542333568. Its totient is φ = 7058026800.

The previous prime is 21203254507. The next prime is 21203254531. The reversal of 21203254524 is 42545230212.

It is a junction number, because it is equal to n+sod(n) for n = 21203254491 and 21203254500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1206502 + ... + 1223949.

Almost surely, 2^21203254524 is an apocalyptic number.

It is an amenable number.

21203254524 is an abundant number, since it is smaller than the sum of its proper divisors (28339079044).

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

21203254524 is a wasteful number, since it uses less digits than its factorization.

21203254524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431185 (or 2431183 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21203254524 its reverse (42545230212), we get a palindrome (63748484736).

The spelling of 21203254524 in words is "twenty-one billion, two hundred three million, two hundred fifty-four thousand, five hundred twenty-four".