21203002554536 has 64 divisors (see below), whose sum is σ = 43498346544000. Its totient is φ = 9609179247360.

The previous prime is 21203002554523. The next prime is 21203002554541. The reversal of 21203002554536 is 63545520030212.

It is a self number, because there is not a number n which added to its sum of digits gives 21203002554536.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79136045 + ... + 79403523.

It is an arithmetic number, because the mean of its divisors is an integer number (679661664750).

Almost surely, 2^{21203002554536} is an apocalyptic number.

It is an amenable number.

21203002554536 is an abundant number, since it is smaller than the sum of its proper divisors (22295343989464).

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

21203002554536 is a wasteful number, since it uses less digits than its factorization.

21203002554536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270162 (or 270158 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 38.

Adding to 21203002554536 its reverse (63545520030212), we get a palindrome (84748522584748).

The spelling of 21203002554536 in words is "twenty-one trillion, two hundred three billion, two million, five hundred fifty-four thousand, five hundred thirty-six".