21201033132 has 144 divisors (see below), whose sum is σ = 59447606400. Its totient is φ = 6340239360.

The previous prime is 21201033109. The next prime is 21201033187. The reversal of 21201033132 is 23133010212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1394532 + ... + 1409652.

It is an arithmetic number, because the mean of its divisors is an integer number (412830600).

Almost surely, 2^21201033132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21201033132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29723803200).

21201033132 is an abundant number, since it is smaller than the sum of its proper divisors (38246573268).

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

21201033132 is a wasteful number, since it uses less digits than its factorization.

21201033132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15256 (or 15251 counting only the distinct ones).

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

Adding to 21201033132 its reverse (23133010212), we get a palindrome (44334043344).

The spelling of 21201033132 in words is "twenty-one billion, two hundred one million, thirty-three thousand, one hundred thirty-two".