21119523 has 4 divisors (see below), whose sum is σ = 28159368. Its totient is φ = 14079680.

The previous prime is 21119503. The next prime is 21119531. The reversal of 21119523 is 32591112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21119523 - 2¹² = 21115427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21119493 and 21119502.

It is not an unprimeable number, because it can be changed into a prime (21119503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3519918 + ... + 3519923.

It is an arithmetic number, because the mean of its divisors is an integer number (7039842).

Almost surely, 2^21119523 is an apocalyptic number.

21119523 is a deficient number, since it is larger than the sum of its proper divisors (7039845).

21119523 is an equidigital number, since it uses as much as digits as its factorization.

21119523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039844.

The product of its digits is 540, while the sum is 24.

The square root of 21119523 is about 4595.5982200362. The cubic root of 21119523 is about 276.4148482051.

The spelling of 21119523 in words is "twenty-one million, one hundred nineteen thousand, five hundred twenty-three".