21001331132 has 12 divisors (see below), whose sum is σ = 36761807040. Its totient is φ = 10497957696.

The previous prime is 21001331077. The next prime is 21001331189. The reversal of 21001331132 is 23113310012.

It is a self number, because there is not a number n which added to its sum of digits gives 21001331132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659468 + ... + 690579.

It is an arithmetic number, because the mean of its divisors is an integer number (3063483920).

Almost surely, 2^21001331132 is an apocalyptic number.

It is an amenable number.

21001331132 is a deficient number, since it is larger than the sum of its proper divisors (15760475908).

21001331132 is a wasteful number, since it uses less digits than its factorization.

21001331132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353940 (or 1353938 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21001331132 its reverse (23113310012), we get a palindrome (44114641144).

The spelling of 21001331132 in words is "twenty-one billion, one million, three hundred thirty-one thousand, one hundred thirty-two".