21052323 has 12 divisors (see below), whose sum is σ = 32009640. Its totient is φ = 13296096.

The previous prime is 21052301. The next prime is 21052331. The reversal of 21052323 is 32325012.

It is a de Polignac number, because none of the positive numbers 2^k-21052323 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21052296 and 21052305.

It is not an unprimeable number, because it can be changed into a prime (21052333) 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, 61386 + ... + 61727.

It is an arithmetic number, because the mean of its divisors is an integer number (2667470).

Almost surely, 2^21052323 is an apocalyptic number.

21052323 is a deficient number, since it is larger than the sum of its proper divisors (10957317).

21052323 is a wasteful number, since it uses less digits than its factorization.

21052323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123138 (or 123135 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21052323 is about 4588.2810506768. The cubic root of 21052323 is about 276.1213628206.

Adding to 21052323 its reverse (32325012), we get a palindrome (53377335).

The spelling of 21052323 in words is "twenty-one million, fifty-two thousand, three hundred twenty-three".