21314523 has 12 divisors (see below), whose sum is σ = 29995368. Its totient is φ = 13461120.

The previous prime is 21314497. The next prime is 21314543. The reversal of 21314523 is 32541312.

It is not a de Polignac number, because 21314523 - 2⁹ = 21314011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21314523.

It is not an unprimeable number, because it can be changed into a prime (21314543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8758 + ... + 10923.

It is an arithmetic number, because the mean of its divisors is an integer number (2499614).

Almost surely, 2^21314523 is an apocalyptic number.

21314523 is a deficient number, since it is larger than the sum of its proper divisors (8680845).

21314523 is a wasteful number, since it uses less digits than its factorization.

21314523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19722 (or 19703 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 21314523 is about 4616.7654261398. The cubic root of 21314523 is about 277.2629710411.

Adding to 21314523 its reverse (32541312), we get a palindrome (53855835).

The spelling of 21314523 in words is "twenty-one million, three hundred fourteen thousand, five hundred twenty-three".