21431410019 has 2 divisors, whose sum is σ = 21431410020. Its totient is φ = 21431410018.

The previous prime is 21431409977. The next prime is 21431410057. The reversal of 21431410019 is 91001413412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21431410019 - 2⁸ = 21431409763 is a prime.

It is a super-2 number, since 2×21431410019² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21431410019.

It is not a weakly prime, because it can be changed into another prime (21431410619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715705009 + 10715705010.

It is an arithmetic number, because the mean of its divisors is an integer number (10715705010).

Almost surely, 2^21431410019 is an apocalyptic number.

21431410019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21431410019 is an equidigital number, since it uses as much as digits as its factorization.

21431410019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 21431410019 in words is "twenty-one billion, four hundred thirty-one million, four hundred ten thousand, nineteen".