21997736165011 has 2 divisors, whose sum is σ = 21997736165012. Its totient is φ = 21997736165010.

The previous prime is 21997736164961. The next prime is 21997736165017. The reversal of 21997736165011 is 11056163779912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21997736165011 - 2³⁷ = 21860297211539 is a prime.

It is not a weakly prime, because it can be changed into another prime (21997736165017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10998868082505 + 10998868082506.

It is an arithmetic number, because the mean of its divisors is an integer number (10998868082506).

Almost surely, 2^{21997736165011} is an apocalyptic number.

21997736165011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21997736165011 is an equidigital number, since it uses as much as digits as its factorization.

21997736165011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4286520, while the sum is 58.

The spelling of 21997736165011 in words is "twenty-one trillion, nine hundred ninety-seven billion, seven hundred thirty-six million, one hundred sixty-five thousand, eleven".