21717067111 has 2 divisors, whose sum is σ = 21717067112. Its totient is φ = 21717067110.

The previous prime is 21717066961. The next prime is 21717067117. The reversal of 21717067111 is 11176071712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21717067111 - 2¹⁵ = 21717034343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21717067117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10858533555 + 10858533556.

It is an arithmetic number, because the mean of its divisors is an integer number (10858533556).

Almost surely, 2^21717067111 is an apocalyptic number.

21717067111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21717067111 is an equidigital number, since it uses as much as digits as its factorization.

21717067111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4116, while the sum is 34.

The spelling of 21717067111 in words is "twenty-one billion, seven hundred seventeen million, sixty-seven thousand, one hundred eleven".