21001132132 has 6 divisors (see below), whose sum is σ = 36751981238. Its totient is φ = 10500566064.

The previous prime is 21001132049. The next prime is 21001132157. The reversal of 21001132132 is 23123110012.

It can be written as a sum of positive squares in only one way, i.e., 11895392356 + 9105739776 = 109066^2 + 95424^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625141513 + ... + 2625141520.

Almost surely, 2^21001132132 is an apocalyptic number.

It is an amenable number.

21001132132 is a deficient number, since it is larger than the sum of its proper divisors (15750849106).

21001132132 is a wasteful number, since it uses less digits than its factorization.

21001132132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250283037 (or 5250283035 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21001132132 its reverse (23123110012), we get a palindrome (44124242144).

The spelling of 21001132132 in words is "twenty-one billion, one million, one hundred thirty-two thousand, one hundred thirty-two".