21174748519 has 2 divisors, whose sum is σ = 21174748520. Its totient is φ = 21174748518.

The previous prime is 21174748513. The next prime is 21174748561. The reversal of 21174748519 is 91584747112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21174748519 - 2⁵ = 21174748487 is a prime.

It is a super-2 number, since 2×21174748519² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21174748513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10587374259 + 10587374260.

It is an arithmetic number, because the mean of its divisors is an integer number (10587374260).

Almost surely, 2^21174748519 is an apocalyptic number.

21174748519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21174748519 is an equidigital number, since it uses as much as digits as its factorization.

21174748519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 49.

The spelling of 21174748519 in words is "twenty-one billion, one hundred seventy-four million, seven hundred forty-eight thousand, five hundred nineteen".