21519169027 has 2 divisors, whose sum is σ = 21519169028. Its totient is φ = 21519169026.

The previous prime is 21519168917. The next prime is 21519169057. The reversal of 21519169027 is 72096191512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21519169027 - 2¹⁹ = 21518644739 is a prime.

It is a super-2 number, since 2×21519169027² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21519169057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10759584513 + 10759584514.

It is an arithmetic number, because the mean of its divisors is an integer number (10759584514).

Almost surely, 2^21519169027 is an apocalyptic number.

21519169027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21519169027 is an equidigital number, since it uses as much as digits as its factorization.

21519169027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 43.

The spelling of 21519169027 in words is "twenty-one billion, five hundred nineteen million, one hundred sixty-nine thousand, twenty-seven".