21356374519 has 2 divisors, whose sum is σ = 21356374520. Its totient is φ = 21356374518.

The previous prime is 21356374513. The next prime is 21356374591. The reversal of 21356374519 is 91547365312.

Together with next prime (21356374591) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21356374519 - 2⁹ = 21356374007 is a prime.

It is a super-2 number, since 2×21356374519² (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 (21356374513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10678187259 + 10678187260.

It is an arithmetic number, because the mean of its divisors is an integer number (10678187260).

Almost surely, 2^21356374519 is an apocalyptic number.

21356374519 is a deficient number, since it is larger than the sum of its proper divisors (1).

21356374519 is an equidigital number, since it uses as much as digits as its factorization.

21356374519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 46.

The spelling of 21356374519 in words is "twenty-one billion, three hundred fifty-six million, three hundred seventy-four thousand, five hundred nineteen".