21231210020324 has 48 divisors (see below), whose sum is σ = 39802999788720. Its totient is φ = 9891306647040.

The previous prime is 21231210020323. The next prime is 21231210020329. The reversal of 21231210020324 is 42302001213212.

It can be written as a sum of positive squares in 8 ways, for example, as 4635624302500 + 16595585717824 = 2153050^2 + 4073768^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21231210020324.

It is not an unprimeable number, because it can be changed into a prime (21231210020323) 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, 27931139 + ... + 28681194.

It is an arithmetic number, because the mean of its divisors is an integer number (829229162265).

Almost surely, 2^{21231210020324} is an apocalyptic number.

It is an amenable number.

21231210020324 is a deficient number, since it is larger than the sum of its proper divisors (18571789768396).

21231210020324 is a wasteful number, since it uses less digits than its factorization.

21231210020324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56612480 (or 56612478 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21231210020324 its reverse (42302001213212), we get a palindrome (63533211233536).

The spelling of 21231210020324 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred ten million, twenty thousand, three hundred twenty-four".