21203534524 has 6 divisors (see below), whose sum is σ = 37106185424. Its totient is φ = 10601767260.

The previous prime is 21203534491. The next prime is 21203534533. The reversal of 21203534524 is 42543530212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650441812 + ... + 2650441819.

Almost surely, 2^21203534524 is an apocalyptic number.

It is an amenable number.

21203534524 is a deficient number, since it is larger than the sum of its proper divisors (15902650900).

21203534524 is a wasteful number, since it uses less digits than its factorization.

21203534524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300883635 (or 5300883633 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 21203534524 in words is "twenty-one billion, two hundred three million, five hundred thirty-four thousand, five hundred twenty-four".