21116515512 has 32 divisors (see below), whose sum is σ = 52802286480. Its totient is φ = 7037372160.

The previous prime is 21116515501. The next prime is 21116515517. The reversal of 21116515512 is 21551561112.

It is a self number, because there is not a number n which added to its sum of digits gives 21116515512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116515517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29212 + ... + 207572.

Almost surely, 2^21116515512 is an apocalyptic number.

It is an amenable number.

21116515512 is an abundant number, since it is smaller than the sum of its proper divisors (31685770968).

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

21116515512 is a wasteful number, since it uses less digits than its factorization.

21116515512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183303 (or 183299 counting only the distinct ones).

The product of its digits is 3000, while the sum is 30.

The spelling of 21116515512 in words is "twenty-one billion, one hundred sixteen million, five hundred fifteen thousand, five hundred twelve".