21954119163827 has 2 divisors, whose sum is σ = 21954119163828. Its totient is φ = 21954119163826.

The previous prime is 21954119163673. The next prime is 21954119163863. The reversal of 21954119163827 is 72836191145912.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21954119163827 is a prime.

It is not a weakly prime, because it can be changed into another prime (21954119163227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10977059581913 + 10977059581914.

It is an arithmetic number, because the mean of its divisors is an integer number (10977059581914).

Almost surely, 2^{21954119163827} is an apocalyptic number.

21954119163827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21954119163827 is an equidigital number, since it uses as much as digits as its factorization.

21954119163827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 59.

The spelling of 21954119163827 in words is "twenty-one trillion, nine hundred fifty-four billion, one hundred nineteen million, one hundred sixty-three thousand, eight hundred twenty-seven".