21473424019 has 2 divisors, whose sum is σ = 21473424020. Its totient is φ = 21473424018.

The previous prime is 21473423953. The next prime is 21473424023. The reversal of 21473424019 is 91042437412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21473424019 is a prime.

It is a super-2 number, since 2×21473424019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21473421019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10736712009 + 10736712010.

It is an arithmetic number, because the mean of its divisors is an integer number (10736712010).

Almost surely, 2^21473424019 is an apocalyptic number.

21473424019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21473424019 is an equidigital number, since it uses as much as digits as its factorization.

21473424019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 21473424019 in words is "twenty-one billion, four hundred seventy-three million, four hundred twenty-four thousand, nineteen".