21165371419 has 2 divisors, whose sum is σ = 21165371420. Its totient is φ = 21165371418.

The previous prime is 21165371407. The next prime is 21165371471. The reversal of 21165371419 is 91417356112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21165371419 - 2¹⁹ = 21164847131 is a prime.

It is a super-2 number, since 2×21165371419² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21165371219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10582685709 + 10582685710.

It is an arithmetic number, because the mean of its divisors is an integer number (10582685710).

Almost surely, 2^21165371419 is an apocalyptic number.

21165371419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21165371419 is an equidigital number, since it uses as much as digits as its factorization.

21165371419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The spelling of 21165371419 in words is "twenty-one billion, one hundred sixty-five million, three hundred seventy-one thousand, four hundred nineteen".