21309003132 has 12 divisors (see below), whose sum is σ = 49721007336. Its totient is φ = 7103001040.

The previous prime is 21309003097. The next prime is 21309003161. The reversal of 21309003132 is 23130090312.

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

It is a super-2 number, since 2×21309003132² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887875119 + ... + 887875142.

It is an arithmetic number, because the mean of its divisors is an integer number (4143417278).

Almost surely, 2^21309003132 is an apocalyptic number.

It is an amenable number.

21309003132 is an abundant number, since it is smaller than the sum of its proper divisors (28412004204).

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

21309003132 is a wasteful number, since it uses less digits than its factorization.

21309003132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775750268 (or 1775750266 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 21309003132 its reverse (23130090312), we get a palindrome (44439093444).

The spelling of 21309003132 in words is "twenty-one billion, three hundred nine million, three thousand, one hundred thirty-two".