21453119 has 2 divisors, whose sum is σ = 21453120. Its totient is φ = 21453118.

The previous prime is 21453101. The next prime is 21453143. The reversal of 21453119 is 91135412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21453119 is a prime.

It is a super-2 number, since 2×21453119² = 920472629656322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21453919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10726559 + 10726560.

It is an arithmetic number, because the mean of its divisors is an integer number (10726560).

Almost surely, 2^21453119 is an apocalyptic number.

21453119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21453119 is an equidigital number, since it uses as much as digits as its factorization.

21453119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 21453119 is about 4631.7511807091. The cubic root of 21453119 is about 277.8626333409.

The spelling of 21453119 in words is "twenty-one million, four hundred fifty-three thousand, one hundred nineteen".