21172580711 has 2 divisors, whose sum is σ = 21172580712. Its totient is φ = 21172580710.

The previous prime is 21172580699. The next prime is 21172580771. The reversal of 21172580711 is 11708527112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21172580711 - 2¹⁴ = 21172564327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21172580771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10586290355 + 10586290356.

It is an arithmetic number, because the mean of its divisors is an integer number (10586290356).

Almost surely, 2^21172580711 is an apocalyptic number.

21172580711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21172580711 is an equidigital number, since it uses as much as digits as its factorization.

21172580711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 35.

The spelling of 21172580711 in words is "twenty-one billion, one hundred seventy-two million, five hundred eighty thousand, seven hundred eleven".