21026013607771 has 2 divisors, whose sum is σ = 21026013607772. Its totient is φ = 21026013607770.

The previous prime is 21026013607769. The next prime is 21026013607883. The reversal of 21026013607771 is 17770631062012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21026013607771 - 2¹ = 21026013607769 is a prime.

Together with 21026013607769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21026013607721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10513006803885 + 10513006803886.

It is an arithmetic number, because the mean of its divisors is an integer number (10513006803886).

Almost surely, 2^{21026013607771} is an apocalyptic number.

21026013607771 is a deficient number, since it is larger than the sum of its proper divisors (1).

21026013607771 is an equidigital number, since it uses as much as digits as its factorization.

21026013607771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 43.

Adding to 21026013607771 its reverse (17770631062012), we get a palindrome (38796644669783).

The spelling of 21026013607771 in words is "twenty-one trillion, twenty-six billion, thirteen million, six hundred seven thousand, seven hundred seventy-one".