20121320233100 has 72 divisors (see below), whose sum is σ = 43913346688848. Its totient is φ = 8002448006400.

The previous prime is 20121320233097. The next prime is 20121320233127. The reversal of 20121320233100 is 133202312102.

It is a super-2 number, since 2×20121320233100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91784219 + ... + 92003181.

Almost surely, 2^{20121320233100} is an apocalyptic number.

20121320233100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20121320233100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21956673344424).

20121320233100 is an abundant number, since it is smaller than the sum of its proper divisors (23792026455748).

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

20121320233100 is a wasteful number, since it uses less digits than its factorization.

20121320233100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224235 (or 224228 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20121320233100 its reverse (133202312102), we get a palindrome (20254522545202).

The spelling of 20121320233100 in words is "twenty trillion, one hundred twenty-one billion, three hundred twenty million, two hundred thirty-three thousand, one hundred".