21550203132 has 12 divisors (see below), whose sum is σ = 50283807336. Its totient is φ = 7183401040.

The previous prime is 21550203131. The next prime is 21550203149. The reversal of 21550203132 is 23130205512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21550203132² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550203131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897925119 + ... + 897925142.

It is an arithmetic number, because the mean of its divisors is an integer number (4190317278).

Almost surely, 2^21550203132 is an apocalyptic number.

It is an amenable number.

21550203132 is an abundant number, since it is smaller than the sum of its proper divisors (28733604204).

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

21550203132 is a wasteful number, since it uses less digits than its factorization.

21550203132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795850268 (or 1795850266 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 21550203132 its reverse (23130205512), we get a palindrome (44680408644).

The spelling of 21550203132 in words is "twenty-one billion, five hundred fifty million, two hundred three thousand, one hundred thirty-two".