12023432421 has 64 divisors (see below), whose sum is σ = 22106413056. Its totient is φ = 5609606400.

The previous prime is 12023432419. The next prime is 12023432423. The reversal of 12023432421 is 12423432021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12023432419) and next prime (12023432423).

It is not a de Polignac number, because 12023432421 - 2¹ = 12023432419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12023432391 and 12023432400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12023432423) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 57006 + ... + 165216.

It is an arithmetic number, because the mean of its divisors is an integer number (345412704).

Almost surely, 2^12023432421 is an apocalyptic number.

12023432421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12023432421 is a deficient number, since it is larger than the sum of its proper divisors (10082980635).

12023432421 is a wasteful number, since it uses less digits than its factorization.

12023432421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108282.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 12023432421 its reverse (12423432021), we get a palindrome (24446864442).

It can be divided in two parts, 12023 and 432421, that added together give a palindrome (444444).

The spelling of 12023432421 in words is "twelve billion, twenty-three million, four hundred thirty-two thousand, four hundred twenty-one".