21000132001 has 4 divisors (see below), whose sum is σ = 21005941572. Its totient is φ = 20994322432.

The previous prime is 21000131989. The next prime is 21000132029. The reversal of 21000132001 is 10023100012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4089730401 + 16910401600 = 63951^2 + 130040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21000132001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000132301) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 2899360 + ... + 2906593.

It is an arithmetic number, because the mean of its divisors is an integer number (5251485393).

Almost surely, 2^21000132001 is an apocalyptic number.

It is an amenable number.

21000132001 is a deficient number, since it is larger than the sum of its proper divisors (5809571).

21000132001 is an equidigital number, since it uses as much as digits as its factorization.

21000132001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5809570.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21000132001 its reverse (10023100012), we get a palindrome (31023232013).

The spelling of 21000132001 in words is "twenty-one billion, one hundred thirty-two thousand, one".