12232121421 has 8 divisors (see below), whose sum is σ = 17564071840. Its totient is φ = 7527459312.

The previous prime is 12232121383. The next prime is 12232121423. The reversal of 12232121421 is 12412123221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12232121421 - 2¹⁵ = 12232088653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12232121423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156822031 + ... + 156822108.

It is an arithmetic number, because the mean of its divisors is an integer number (2195508980).

Almost surely, 2^12232121421 is an apocalyptic number.

It is an amenable number.

12232121421 is a deficient number, since it is larger than the sum of its proper divisors (5331950419).

12232121421 is a wasteful number, since it uses less digits than its factorization.

12232121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313644155.

The product of its digits is 384, while the sum is 21.

Adding to 12232121421 its reverse (12412123221), we get a palindrome (24644244642).

The spelling of 12232121421 in words is "twelve billion, two hundred thirty-two million, one hundred twenty-one thousand, four hundred twenty-one".