12121421432 has 8 divisors (see below), whose sum is σ = 22727665200. Its totient is φ = 6060710712.

The previous prime is 12121421407. The next prime is 12121421443. The reversal of 12121421432 is 23412412121.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 12121421398 and 12121421407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 757588832 + ... + 757588847.

It is an arithmetic number, because the mean of its divisors is an integer number (2840958150).

Almost surely, 2^12121421432 is an apocalyptic number.

It is an amenable number.

12121421432 is a deficient number, since it is larger than the sum of its proper divisors (10606243768).

12121421432 is a wasteful number, since it uses less digits than its factorization.

12121421432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515177685 (or 1515177681 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

Adding to 12121421432 its reverse (23412412121), we get a palindrome (35533833553).

The spelling of 12121421432 in words is "twelve billion, one hundred twenty-one million, four hundred twenty-one thousand, four hundred thirty-two".