21711260279 has 2 divisors, whose sum is σ = 21711260280. Its totient is φ = 21711260278.

The previous prime is 21711260257. The next prime is 21711260299. The reversal of 21711260279 is 97206211712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21711260279 - 2⁸ = 21711260023 is a prime.

It is a super-3 number, since 3×21711260279³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21711260209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10855630139 + 10855630140.

It is an arithmetic number, because the mean of its divisors is an integer number (10855630140).

Almost surely, 2^21711260279 is an apocalyptic number.

21711260279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21711260279 is an equidigital number, since it uses as much as digits as its factorization.

21711260279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 38.

The spelling of 21711260279 in words is "twenty-one billion, seven hundred eleven million, two hundred sixty thousand, two hundred seventy-nine".