21331120001 has 2 divisors, whose sum is σ = 21331120002. Its totient is φ = 21331120000.

The previous prime is 21331119989. The next prime is 21331120033. The reversal of 21331120001 is 10002113312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16297075600 + 5034044401 = 127660^2 + 70951^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331120001 - 2¹⁸ = 21330857857 is a prime.

It is not a weakly prime, because it can be changed into another prime (21331120091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665560000 + 10665560001.

It is an arithmetic number, because the mean of its divisors is an integer number (10665560001).

Almost surely, 2^21331120001 is an apocalyptic number.

It is an amenable number.

21331120001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331120001 is an equidigital number, since it uses as much as digits as its factorization.

21331120001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21331120001 its reverse (10002113312), we get a palindrome (31333233313).

The spelling of 21331120001 in words is "twenty-one billion, three hundred thirty-one million, one hundred twenty thousand, one".