21550540430 has 16 divisors (see below), whose sum is σ = 40832603280. Its totient is φ = 8166520512.

The previous prime is 21550540409. The next prime is 21550540441. The reversal of 21550540430 is 3404505512.

It is a junction number, because it is equal to n+sod(n) for n = 21550540393 and 21550540402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56711759 + ... + 56712138.

It is an arithmetic number, because the mean of its divisors is an integer number (2552037705).

Almost surely, 2^21550540430 is an apocalyptic number.

21550540430 is a deficient number, since it is larger than the sum of its proper divisors (19282062850).

21550540430 is a wasteful number, since it uses less digits than its factorization.

21550540430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113423923.

The product of its (nonzero) digits is 12000, while the sum is 29.

The spelling of 21550540430 in words is "twenty-one billion, five hundred fifty million, five hundred forty thousand, four hundred thirty".