20421323511236 has 6 divisors (see below), whose sum is σ = 35737316144670. Its totient is φ = 10210661755616.

The previous prime is 20421323511233. The next prime is 20421323511293. The reversal of 20421323511236 is 63211532312402.

It can be written as a sum of positive squares in only one way, i.e., 19940511630400 + 480811880836 = 4465480^2 + 693406^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20421323511196 and 20421323511205.

It is not an unprimeable number, because it can be changed into a prime (20421323511233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2552665438901 + ... + 2552665438908.

It is an arithmetic number, because the mean of its divisors is an integer number (5956219357445).

Almost surely, 2^{20421323511236} is an apocalyptic number.

It is an amenable number.

20421323511236 is a deficient number, since it is larger than the sum of its proper divisors (15315992633434).

20421323511236 is a wasteful number, since it uses less digits than its factorization.

20421323511236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105330877813 (or 5105330877811 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 20421323511236 its reverse (63211532312402), we get a palindrome (83632855823638).

The spelling of 20421323511236 in words is "twenty trillion, four hundred twenty-one billion, three hundred twenty-three million, five hundred eleven thousand, two hundred thirty-six".