21914419 has 2 divisors, whose sum is σ = 21914420. Its totient is φ = 21914418.

The previous prime is 21914413. The next prime is 21914443. The reversal of 21914419 is 91441912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21914419 - 2¹⁷ = 21783347 is a prime.

It is a super-2 number, since 2×21914419² = 960483520215122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21914413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10957209 + 10957210.

It is an arithmetic number, because the mean of its divisors is an integer number (10957210).

Almost surely, 2^21914419 is an apocalyptic number.

21914419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21914419 is an equidigital number, since it uses as much as digits as its factorization.

21914419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 31.

The square root of 21914419 is about 4681.2839050842. The cubic root of 21914419 is about 279.8401255690.

The spelling of 21914419 in words is "twenty-one million, nine hundred fourteen thousand, four hundred nineteen".