20121132312 has 24 divisors (see below), whose sum is σ = 54494733540. Its totient is φ = 6707044080.

The previous prime is 20121132257. The next prime is 20121132377. The reversal of 20121132312 is 21323112102.

20121132312 is a `hidden beast` number, since 201 + 21 + 132 + 312 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

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 5 ways as a sum of consecutive naturals, for example, 139730014 + ... + 139730157.

Almost surely, 2^20121132312 is an apocalyptic number.

It is an amenable number.

20121132312 is an abundant number, since it is smaller than the sum of its proper divisors (34373601228).

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

20121132312 is a wasteful number, since it uses less digits than its factorization.

20121132312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279460183 (or 279460176 counting only the distinct ones).

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

Adding to 20121132312 its reverse (21323112102), we get a palindrome (41444244414).

The spelling of 20121132312 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-two thousand, three hundred twelve".