21413555505 has 24 divisors (see below), whose sum is σ = 38314149120. Its totient is φ = 11052156960.

The previous prime is 21413555489. The next prime is 21413555531. The reversal of 21413555505 is 50555531412.

21413555505 is a `hidden beast` number, since 2 + 14 + 135 + 5 + 5 + 505 = 666.

It is not a de Polignac number, because 21413555505 - 2⁴ = 21413555489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21413555505.

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 in 23 ways as a sum of consecutive naturals, for example, 7673715 + ... + 7676504.

It is an arithmetic number, because the mean of its divisors is an integer number (1596422880).

Almost surely, 2^21413555505 is an apocalyptic number.

It is an amenable number.

21413555505 is a deficient number, since it is larger than the sum of its proper divisors (16900593615).

21413555505 is a wasteful number, since it uses less digits than its factorization.

21413555505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15350261 (or 15350258 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 21413555505 in words is "twenty-one billion, four hundred thirteen million, five hundred fifty-five thousand, five hundred five".