21313352452 has 48 divisors (see below), whose sum is σ = 44119676160. Its totient is φ = 8814701952.

The previous prime is 21313352443. The next prime is 21313352453. The reversal of 21313352452 is 25425331312.

It is not an unprimeable number, because it can be changed into a prime (21313352453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1856193 + ... + 1867639.

It is an arithmetic number, because the mean of its divisors is an integer number (919159920).

Almost surely, 2^21313352452 is an apocalyptic number.

It is an amenable number.

21313352452 is an abundant number, since it is smaller than the sum of its proper divisors (22806323708).

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

21313352452 is a wasteful number, since it uses less digits than its factorization.

21313352452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13780 (or 13778 counting only the distinct ones).

The product of its digits is 21600, while the sum is 31.

Adding to 21313352452 its reverse (25425331312), we get a palindrome (46738683764).

The spelling of 21313352452 in words is "twenty-one billion, three hundred thirteen million, three hundred fifty-two thousand, four hundred fifty-two".