12132321012 has 108 divisors (see below), whose sum is σ = 35743554756. Its totient is φ = 3459697920.

The previous prime is 12132320999. The next prime is 12132321023. The reversal of 12132321012 is 21012323121.

12132321012 is a `hidden beast` number, since 121 + 323 + 210 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8709368976 + 3422952036 = 93324^2 + 58506^2 .

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 35 ways as a sum of consecutive naturals, for example, 947968 + ... + 960680.

Almost surely, 2^12132321012 is an apocalyptic number.

12132321012 is a gapful number since it is divisible by the number (12) 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 12132321012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17871777378).

12132321012 is an abundant number, since it is smaller than the sum of its proper divisors (23611233744).

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

12132321012 is a wasteful number, since it uses less digits than its factorization.

12132321012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13278 (or 13266 counting only the distinct ones).

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

Adding to 12132321012 its reverse (21012323121), we get a palindrome (33144644133).

The spelling of 12132321012 in words is "twelve billion, one hundred thirty-two million, three hundred twenty-one thousand, twelve".