21746918419 has 2 divisors, whose sum is σ = 21746918420. Its totient is φ = 21746918418.

The previous prime is 21746918329. The next prime is 21746918443. The reversal of 21746918419 is 91481964712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21746918419 - 2¹¹ = 21746916371 is a prime.

It is a super-2 number, since 2×21746918419² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21746918519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10873459209 + 10873459210.

It is an arithmetic number, because the mean of its divisors is an integer number (10873459210).

Almost surely, 2^21746918419 is an apocalyptic number.

21746918419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21746918419 is an equidigital number, since it uses as much as digits as its factorization.

21746918419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 52.

The spelling of 21746918419 in words is "twenty-one billion, seven hundred forty-six million, nine hundred eighteen thousand, four hundred nineteen".