21253252323 has 16 divisors (see below), whose sum is σ = 28731701376. Its totient is φ = 13972445760.

The previous prime is 21253252309. The next prime is 21253252331. The reversal of 21253252323 is 32325235212.

It is not a de Polignac number, because 21253252323 - 2²¹ = 21251155171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21253252303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58183 + ... + 214223.

It is an arithmetic number, because the mean of its divisors is an integer number (1795731336).

Almost surely, 2^21253252323 is an apocalyptic number.

21253252323 is a deficient number, since it is larger than the sum of its proper divisors (7478449053).

21253252323 is a wasteful number, since it uses less digits than its factorization.

21253252323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156674.

The product of its digits is 21600, while the sum is 30.

Adding to 21253252323 its reverse (32325235212), we get a palindrome (53578487535).

The spelling of 21253252323 in words is "twenty-one billion, two hundred fifty-three million, two hundred fifty-two thousand, three hundred twenty-three".