20131323212 has 288 divisors, whose sum is σ = 49650155520. Its totient is φ = 6945523200.

The previous prime is 20131323209. The next prime is 20131323221. The reversal of 20131323212 is 21232313102.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 158514293 + ... + 158514419.

Almost surely, 2^20131323212 is an apocalyptic number.

20131323212 is a gapful number since it is divisible by the number (22) 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 20131323212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24825077760).

20131323212 is an abundant number, since it is smaller than the sum of its proper divisors (29518832308).

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

20131323212 is a wasteful number, since it uses less digits than its factorization.

20131323212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 280 counting only the distinct ones).

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

Adding to 20131323212 its reverse (21232313102), we get a palindrome (41363636314).

It can be divided in two parts, 20131 and 323212, that added together give a palindrome (343343).

The spelling of 20131323212 in words is "twenty billion, one hundred thirty-one million, three hundred twenty-three thousand, two hundred twelve".