21954119163863 has 2 divisors, whose sum is σ = 21954119163864. Its totient is φ = 21954119163862.

The previous prime is 21954119163827. The next prime is 21954119163881. The reversal of 21954119163863 is 36836191145912.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21954119163863 - 2⁸ = 21954119163607 is a prime.

It is a super-2 number, since 2×21954119163863² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21954119463863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10977059581931 + 10977059581932.

It is an arithmetic number, because the mean of its divisors is an integer number (10977059581932).

Almost surely, 2^{21954119163863} is an apocalyptic number.

21954119163863 is a deficient number, since it is larger than the sum of its proper divisors (1).

21954119163863 is an equidigital number, since it uses as much as digits as its factorization.

21954119163863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8398080, while the sum is 59.

The spelling of 21954119163863 in words is "twenty-one trillion, nine hundred fifty-four billion, one hundred nineteen million, one hundred sixty-three thousand, eight hundred sixty-three".