12231420021 has 6 divisors (see below), whose sum is σ = 17667606710. Its totient is φ = 8154280008.

The previous prime is 12231420017. The next prime is 12231420029. The reversal of 12231420021 is 12002413221.

It is a happy number.

12231420021 is a `hidden beast` number, since 1 + 223 + 1 + 420 + 0 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9806940900 + 2424479121 = 99030^2 + 49239^2 .

It is not a de Polignac number, because 12231420021 - 2² = 12231420017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12231419976 and 12231420003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12231420029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 679523326 + ... + 679523343.

Almost surely, 2^12231420021 is an apocalyptic number.

It is an amenable number.

12231420021 is a deficient number, since it is larger than the sum of its proper divisors (5436186689).

12231420021 is a wasteful number, since it uses less digits than its factorization.

12231420021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359046675 (or 1359046672 counting only the distinct ones).

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

Adding to 12231420021 its reverse (12002413221), we get a palindrome (24233833242).

The spelling of 12231420021 in words is "twelve billion, two hundred thirty-one million, four hundred twenty thousand, twenty-one".