21997067551183 has 2 divisors, whose sum is σ = 21997067551184. Its totient is φ = 21997067551182.

The previous prime is 21997067551171. The next prime is 21997067551213. The reversal of 21997067551183 is 38115576079912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21997067551183 - 2²¹ = 21997065454031 is a prime.

It is a super-4 number, since 4×21997067551183⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21997067551133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10998533775591 + 10998533775592.

It is an arithmetic number, because the mean of its divisors is an integer number (10998533775592).

Almost surely, 2^{21997067551183} is an apocalyptic number.

21997067551183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21997067551183 is an equidigital number, since it uses as much as digits as its factorization.

21997067551183 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28576800, while the sum is 64.

The spelling of 21997067551183 in words is "twenty-one trillion, nine hundred ninety-seven billion, sixty-seven million, five hundred fifty-one thousand, one hundred eighty-three".