21695750071 has 2 divisors, whose sum is σ = 21695750072. Its totient is φ = 21695750070.

The previous prime is 21695750053. The next prime is 21695750099. The reversal of 21695750071 is 17005759612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21695750071 is a prime.

It is a super-2 number, since 2×21695750071² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21695750471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10847875035 + 10847875036.

It is an arithmetic number, because the mean of its divisors is an integer number (10847875036).

Almost surely, 2^21695750071 is an apocalyptic number.

21695750071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21695750071 is an equidigital number, since it uses as much as digits as its factorization.

21695750071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 43.

The spelling of 21695750071 in words is "twenty-one billion, six hundred ninety-five million, seven hundred fifty thousand, seventy-one".