20121213312 has 96 divisors (see below), whose sum is σ = 59465902080. Its totient is φ = 6525785088.

The previous prime is 20121213293. The next prime is 20121213323. The reversal of 20121213312 is 21331212102.

20121213312 is a `hidden beast` number, since 20 + 121 + 213 + 312 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 193408 + ... + 278655.

It is an arithmetic number, because the mean of its divisors is an integer number (619436480).

Almost surely, 2^20121213312 is an apocalyptic number.

It is an amenable number.

20121213312 is an abundant number, since it is smaller than the sum of its proper divisors (39344688768).

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

20121213312 is a wasteful number, since it uses less digits than its factorization.

20121213312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472120 (or 472105 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20121213312 its reverse (21331212102), we get a palindrome (41452425414).

The spelling of 20121213312 in words is "twenty billion, one hundred twenty-one million, two hundred thirteen thousand, three hundred twelve".