21440297419 has 2 divisors, whose sum is σ = 21440297420. Its totient is φ = 21440297418.

The previous prime is 21440297401. The next prime is 21440297423. The reversal of 21440297419 is 91479204412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21440297419 - 2¹⁷ = 21440166347 is a prime.

It is a super-2 number, since 2×21440297419² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21440297479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720148709 + 10720148710.

It is an arithmetic number, because the mean of its divisors is an integer number (10720148710).

Almost surely, 2^21440297419 is an apocalyptic number.

21440297419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21440297419 is an equidigital number, since it uses as much as digits as its factorization.

21440297419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 21440297419 in words is "twenty-one billion, four hundred forty million, two hundred ninety-seven thousand, four hundred nineteen".