21585139452419 has 2 divisors, whose sum is σ = 21585139452420. Its totient is φ = 21585139452418.

The previous prime is 21585139452323. The next prime is 21585139452427. The reversal of 21585139452419 is 91425493158512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21585139452419 is a prime.

It is a super-2 number, since 2×21585139452419² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21585139452449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10792569726209 + 10792569726210.

It is an arithmetic number, because the mean of its divisors is an integer number (10792569726210).

Almost surely, 2^{21585139452419} is an apocalyptic number.

21585139452419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21585139452419 is an equidigital number, since it uses as much as digits as its factorization.

21585139452419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552000, while the sum is 59.

The spelling of 21585139452419 in words is "twenty-one trillion, five hundred eighty-five billion, one hundred thirty-nine million, four hundred fifty-two thousand, four hundred nineteen".