21536214500 has 48 divisors (see below), whose sum is σ = 47218390128. Its totient is φ = 8580915200.

The previous prime is 21536214451. The next prime is 21536214503. The reversal of 21536214500 is 541263512.

It can be written as a sum of positive squares in 8 ways, for example, as 3785448676 + 17750765824 = 61526^2 + 133232^2 .

It is not an unprimeable number, because it can be changed into a prime (21536214503) 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, 44702 + ... + 212298.

It is an arithmetic number, because the mean of its divisors is an integer number (983716461).

Almost surely, 2^21536214500 is an apocalyptic number.

21536214500 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 21536214500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23609195064).

21536214500 is an abundant number, since it is smaller than the sum of its proper divisors (25682175628).

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

21536214500 is a wasteful number, since it uses less digits than its factorization.

21536214500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167873 (or 167861 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 21536214500 in words is "twenty-one billion, five hundred thirty-six million, two hundred fourteen thousand, five hundred".