21518659113 has 16 divisors (see below), whose sum is σ = 32808723840. Its totient is φ = 12289481856.

The previous prime is 21518659103. The next prime is 21518659121. The reversal of 21518659113 is 31195681512.

It is not a de Polignac number, because 21518659113 - 2¹³ = 21518650921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21518659103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248820 + ... + 323957.

It is an arithmetic number, because the mean of its divisors is an integer number (2050545240).

Almost surely, 2^21518659113 is an apocalyptic number.

It is an amenable number.

21518659113 is a deficient number, since it is larger than the sum of its proper divisors (11290064727).

21518659113 is a wasteful number, since it uses less digits than its factorization.

21518659113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574576.

The product of its digits is 64800, while the sum is 42.

The spelling of 21518659113 in words is "twenty-one billion, five hundred eighteen million, six hundred fifty-nine thousand, one hundred thirteen".