21001323132 has 36 divisors (see below), whose sum is σ = 53109472416. Its totient is φ = 6997435200.

The previous prime is 21001323131. The next prime is 21001323149. The reversal of 21001323132 is 23132310012.

21001323132 is a `hidden beast` number, since 210 + 0 + 1 + 323 + 132 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001323131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39433 + ... + 208704.

Almost surely, 2^21001323132 is an apocalyptic number.

It is an amenable number.

21001323132 is an abundant number, since it is smaller than the sum of its proper divisors (32108149284).

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

21001323132 is a wasteful number, since it uses less digits than its factorization.

21001323132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250498 (or 250493 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21001323132 its reverse (23132310012), we get a palindrome (44133633144).

The spelling of 21001323132 in words is "twenty-one billion, one million, three hundred twenty-three thousand, one hundred thirty-two".