21897231179183 has 2 divisors, whose sum is σ = 21897231179184. Its totient is φ = 21897231179182.

The previous prime is 21897231179123. The next prime is 21897231179233. The reversal of 21897231179183 is 38197113279812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21897231179183 - 2¹⁶ = 21897231113647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21897231179123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10948615589591 + 10948615589592.

It is an arithmetic number, because the mean of its divisors is an integer number (10948615589592).

Almost surely, 2^{21897231179183} is an apocalyptic number.

21897231179183 is a deficient number, since it is larger than the sum of its proper divisors (1).

21897231179183 is an equidigital number, since it uses as much as digits as its factorization.

21897231179183 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 62.

The spelling of 21897231179183 in words is "twenty-one trillion, eight hundred ninety-seven billion, two hundred thirty-one million, one hundred seventy-nine thousand, one hundred eighty-three".