20121013312 has 28 divisors (see below), whose sum is σ = 40056060096. Its totient is φ = 10028147840.

The previous prime is 20121013279. The next prime is 20121013313. The reversal of 20121013312 is 21331012102.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20121013313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485548 + ... + 525355.

Almost surely, 2^20121013312 is an apocalyptic number.

It is an amenable number.

20121013312 is a deficient number, since it is larger than the sum of its proper divisors (19935046784).

20121013312 is a wasteful number, since it uses less digits than its factorization.

20121013312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011226 (or 1011216 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20121013312 its reverse (21331012102), we get a palindrome (41452025414).

The spelling of 20121013312 in words is "twenty billion, one hundred twenty-one million, thirteen thousand, three hundred twelve".