21586670419 has 2 divisors, whose sum is σ = 21586670420. Its totient is φ = 21586670418.

The previous prime is 21586670389. The next prime is 21586670429. The reversal of 21586670419 is 91407668512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21586670419 - 2⁷ = 21586670291 is a prime.

It is a super-2 number, since 2×21586670419² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21586670429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10793335209 + 10793335210.

It is an arithmetic number, because the mean of its divisors is an integer number (10793335210).

Almost surely, 2^21586670419 is an apocalyptic number.

21586670419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21586670419 is an equidigital number, since it uses as much as digits as its factorization.

21586670419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 21586670419 in words is "twenty-one billion, five hundred eighty-six million, six hundred seventy thousand, four hundred nineteen".