21243405310052 has 24 divisors (see below), whose sum is σ = 38458163016000. Its totient is φ = 10255363954976.

The previous prime is 21243405309979. The next prime is 21243405310063. The reversal of 21243405310052 is 25001350434212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17975633 + ... + 19120935.

It is an arithmetic number, because the mean of its divisors is an integer number (1602423459000).

Almost surely, 2^{21243405310052} is an apocalyptic number.

It is an amenable number.

21243405310052 is a deficient number, since it is larger than the sum of its proper divisors (17214757705948).

21243405310052 is a wasteful number, since it uses less digits than its factorization.

21243405310052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305235 (or 1305233 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 21243405310052 its reverse (25001350434212), we get a palindrome (46244755744264).

The spelling of 21243405310052 in words is "twenty-one trillion, two hundred forty-three billion, four hundred five million, three hundred ten thousand, fifty-two".