21211340330501 has 2 divisors, whose sum is σ = 21211340330502. Its totient is φ = 21211340330500.

The previous prime is 21211340330471. The next prime is 21211340330503. The reversal of 21211340330501 is 10503304311212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18052726322500 + 3158614008001 = 4248850^2 + 1777249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211340330501 is a prime.

It is a super-2 number, since 2×21211340330501² (a number of 27 digits) contains 22 as substring.

Together with 21211340330503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211340330503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605670165250 + 10605670165251.

It is an arithmetic number, because the mean of its divisors is an integer number (10605670165251).

Almost surely, 2^{21211340330501} is an apocalyptic number.

It is an amenable number.

21211340330501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211340330501 is an equidigital number, since it uses as much as digits as its factorization.

21211340330501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 21211340330501 its reverse (10503304311212), we get a palindrome (31714644641713).

The spelling of 21211340330501 in words is "twenty-one trillion, two hundred eleven billion, three hundred forty million, three hundred thirty thousand, five hundred one".