21183553019 has 2 divisors, whose sum is σ = 21183553020. Its totient is φ = 21183553018.

The previous prime is 21183552991. The next prime is 21183553043. The reversal of 21183553019 is 91035538112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21183553019 is a prime.

It is a super-2 number, since 2×21183553019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21183553099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10591776509 + 10591776510.

It is an arithmetic number, because the mean of its divisors is an integer number (10591776510).

Almost surely, 2^21183553019 is an apocalyptic number.

21183553019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21183553019 is an equidigital number, since it uses as much as digits as its factorization.

21183553019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 21183553019 in words is "twenty-one billion, one hundred eighty-three million, five hundred fifty-three thousand, nineteen".