21036134600 has 96 divisors (see below), whose sum is σ = 53665393320. Its totient is φ = 7620587520.

The previous prime is 21036134569. The next prime is 21036134633. The reversal of 21036134600 is 643163012.

It can be written as a sum of positive squares in 12 ways, for example, as 397364356 + 20638770244 = 19934^2 + 143662^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 21036134600.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61472 + ... + 214128.

Almost surely, 2^21036134600 is an apocalyptic number.

21036134600 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 21036134600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26832696660).

21036134600 is an abundant number, since it is smaller than the sum of its proper divisors (32629258720).

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

21036134600 is a wasteful number, since it uses less digits than its factorization.

21036134600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152739 (or 152730 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21036134600 its reverse (643163012), we get a palindrome (21679297612).

The spelling of 21036134600 in words is "twenty-one billion, thirty-six million, one hundred thirty-four thousand, six hundred".