12210023421 has 24 divisors (see below), whose sum is σ = 18292758744. Its totient is φ = 7841577600.

The previous prime is 12210023417. The next prime is 12210023429. The reversal of 12210023421 is 12432001221.

It is a happy number.

12210023421 is a `hidden beast` number, since 1 + 221 + 0 + 0 + 23 + 421 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10058084100 + 2151939321 = 100290^2 + 46389^2 .

It is not a de Polignac number, because 12210023421 - 2² = 12210023417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12210023394 and 12210023403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210023429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147886 + ... + 215151.

It is an arithmetic number, because the mean of its divisors is an integer number (762198281).

Almost surely, 2^12210023421 is an apocalyptic number.

It is an amenable number.

12210023421 is a deficient number, since it is larger than the sum of its proper divisors (6082735323).

12210023421 is a wasteful number, since it uses less digits than its factorization.

12210023421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363181 (or 363178 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12210023421 its reverse (12432001221), we get a palindrome (24642024642).

The spelling of 12210023421 in words is "twelve billion, two hundred ten million, twenty-three thousand, four hundred twenty-one".