21323110452 has 48 divisors (see below), whose sum is σ = 57238228992. Its totient is φ = 6051967200.

The previous prime is 21323110451. The next prime is 21323110469. The reversal of 21323110452 is 25401132312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323110451) 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, 827868 + ... + 853235.

It is an arithmetic number, because the mean of its divisors is an integer number (1192463104).

Almost surely, 2^21323110452 is an apocalyptic number.

It is an amenable number.

21323110452 is an abundant number, since it is smaller than the sum of its proper divisors (35915118540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21323110452 is a wasteful number, since it uses less digits than its factorization.

21323110452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681268 (or 1681266 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21323110452 its reverse (25401132312), we get a palindrome (46724242764).

The spelling of 21323110452 in words is "twenty-one billion, three hundred twenty-three million, one hundred ten thousand, four hundred fifty-two".