21116535104 has 84 divisors (see below), whose sum is σ = 48931701984. Its totient is φ = 9015181056.

The previous prime is 21116535101. The next prime is 21116535131. The reversal of 21116535104 is 40153561112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116535101) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 811967 + ... + 837569.

Almost surely, 2^21116535104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21116535104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24465850992).

21116535104 is an abundant number, since it is smaller than the sum of its proper divisors (27815166880).

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

21116535104 is a wasteful number, since it uses less digits than its factorization.

21116535104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25892 (or 25875 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The spelling of 21116535104 in words is "twenty-one billion, one hundred sixteen million, five hundred thirty-five thousand, one hundred four".