21031332001 has 2 divisors, whose sum is σ = 21031332002. Its totient is φ = 21031332000.

The previous prime is 21031331999. The next prime is 21031332011. The reversal of 21031332001 is 10023313012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13473637776 + 7557694225 = 116076^2 + 86935^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031332001 - 2¹ = 21031331999 is a prime.

Together with 21031331999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21031332011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515666000 + 10515666001.

It is an arithmetic number, because the mean of its divisors is an integer number (10515666001).

Almost surely, 2^21031332001 is an apocalyptic number.

It is an amenable number.

21031332001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031332001 is an equidigital number, since it uses as much as digits as its factorization.

21031332001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21031332001 its reverse (10023313012), we get a palindrome (31054645013).

The spelling of 21031332001 in words is "twenty-one billion, thirty-one million, three hundred thirty-two thousand, one".