21503232200 has 36 divisors (see below), whose sum is σ = 49999836915. Its totient is φ = 8600463360.

The previous prime is 21503232199. The next prime is 21503232251. The reversal of 21503232200 is 223230512.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 192487876 + 21310744324 = 13874^2 + 145982^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=103690.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2068616 + ... + 2078984.

Almost surely, 2^21503232200 is an apocalyptic number.

21503232200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21503232200 is an abundant number, since it is smaller than the sum of its proper divisors (28496604715).

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

21503232200 is an frugal number, since it uses more digits than its factorization.

21503232200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20754 (or 10376 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 21503232200 its reverse (223230512), we get a palindrome (21726462712).

The spelling of 21503232200 in words is "twenty-one billion, five hundred three million, two hundred thirty-two thousand, two hundred".