21746419 has 2 divisors, whose sum is σ = 21746420. Its totient is φ = 21746418.

The previous prime is 21746399. The next prime is 21746423. The reversal of 21746419 is 91464712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21746419 is a prime.

It is a super-2 number, since 2×21746419² = 945813478647122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21746429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10873209 + 10873210.

It is an arithmetic number, because the mean of its divisors is an integer number (10873210).

Almost surely, 2^21746419 is an apocalyptic number.

21746419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21746419 is an equidigital number, since it uses as much as digits as its factorization.

21746419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 21746419 is about 4663.3055872417. The cubic root of 21746419 is about 279.1231882785.

The spelling of 21746419 in words is "twenty-one million, seven hundred forty-six thousand, four hundred nineteen".