21230320054556 has 12 divisors (see below), whose sum is σ = 37233304288992. Its totient is φ = 10592233114848.

The previous prime is 21230320054501. The next prime is 21230320054637. The reversal of 21230320054556 is 65545002303212.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 5731726025 + ... + 5731729728.

It is an arithmetic number, because the mean of its divisors is an integer number (3102775357416).

Almost surely, 2^{21230320054556} is an apocalyptic number.

It is an amenable number.

21230320054556 is a deficient number, since it is larger than the sum of its proper divisors (16002984234436).

21230320054556 is a wasteful number, since it uses less digits than its factorization.

21230320054556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11463456220 (or 11463456218 counting only the distinct ones).

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

Adding to 21230320054556 its reverse (65545002303212), we get a palindrome (86775322357768).

The spelling of 21230320054556 in words is "twenty-one trillion, two hundred thirty billion, three hundred twenty million, fifty-four thousand, five hundred fifty-six".