21131419 has 2 divisors, whose sum is σ = 21131420. Its totient is φ = 21131418.

The previous prime is 21131399. The next prime is 21131423. The reversal of 21131419 is 91413112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21131419 - 2²³ = 12742811 is a prime.

It is a super-2 number, since 2×21131419² = 893073737907122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21131419.

It is not a weakly prime, because it can be changed into another prime (21131449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565709 + 10565710.

It is an arithmetic number, because the mean of its divisors is an integer number (10565710).

Almost surely, 2^21131419 is an apocalyptic number.

21131419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131419 is an equidigital number, since it uses as much as digits as its factorization.

21131419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

The square root of 21131419 is about 4596.8923198178. The cubic root of 21131419 is about 276.4667372217.

The spelling of 21131419 in words is "twenty-one million, one hundred thirty-one thousand, four hundred nineteen".