21614197819 has 2 divisors, whose sum is σ = 21614197820. Its totient is φ = 21614197818.

The previous prime is 21614197807. The next prime is 21614197823. The reversal of 21614197819 is 91879141612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21614197819 - 2¹³ = 21614189627 is a prime.

It is a super-2 number, since 2×21614197819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21614197879) 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, 10807098909 + 10807098910.

It is an arithmetic number, because the mean of its divisors is an integer number (10807098910).

Almost surely, 2^21614197819 is an apocalyptic number.

21614197819 is a deficient number, since it is larger than the sum of its proper divisors (1).

21614197819 is an equidigital number, since it uses as much as digits as its factorization.

21614197819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 49.

The spelling of 21614197819 in words is "twenty-one billion, six hundred fourteen million, one hundred ninety-seven thousand, eight hundred nineteen".