21242450524 has 12 divisors (see below), whose sum is σ = 37697870448. Its totient is φ = 10471630400.

The previous prime is 21242450501. The next prime is 21242450549. The reversal of 21242450524 is 42505424212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37398397 + ... + 37398964.

It is an arithmetic number, because the mean of its divisors is an integer number (3141489204).

Almost surely, 2^21242450524 is an apocalyptic number.

It is an amenable number.

21242450524 is a deficient number, since it is larger than the sum of its proper divisors (16455419924).

21242450524 is a wasteful number, since it uses less digits than its factorization.

21242450524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74797436 (or 74797434 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 21242450524 its reverse (42505424212), we get a palindrome (63747874736).

The spelling of 21242450524 in words is "twenty-one billion, two hundred forty-two million, four hundred fifty thousand, five hundred twenty-four".