21160053500 has 48 divisors (see below), whose sum is σ = 46258273152. Its totient is φ = 8455832000.

The previous prime is 21160053403. The next prime is 21160053511. The reversal of 21160053500 is 535006112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510557 + ... + 550443.

It is an arithmetic number, because the mean of its divisors is an integer number (963714024).

Almost surely, 2^21160053500 is an apocalyptic number.

21160053500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21160053500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23129136576).

21160053500 is an abundant number, since it is smaller than the sum of its proper divisors (25098219652).

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

21160053500 is a wasteful number, since it uses less digits than its factorization.

21160053500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40967 (or 40955 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21160053500 its reverse (535006112), we get a palindrome (21695059612).

The spelling of 21160053500 in words is "twenty-one billion, one hundred sixty million, fifty-three thousand, five hundred".