12221133021 has 6 divisors (see below), whose sum is σ = 17652747710. Its totient is φ = 8147422008.

The previous prime is 12221132993. The next prime is 12221133037. The reversal of 12221133021 is 12033112221.

12221133021 is a `hidden beast` number, since 122 + 211 + 330 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11576684025 + 644448996 = 107595^2 + 25386^2 .

It is not a de Polignac number, because 12221133021 - 2⁹ = 12221132509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221132985 and 12221133003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221133521) 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, 678951826 + ... + 678951843.

Almost surely, 2^12221133021 is an apocalyptic number.

It is an amenable number.

12221133021 is a deficient number, since it is larger than the sum of its proper divisors (5431614689).

12221133021 is a wasteful number, since it uses less digits than its factorization.

12221133021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357903675 (or 1357903672 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12221133021 its reverse (12033112221), we get a palindrome (24254245242).

The spelling of 12221133021 in words is "twelve billion, two hundred twenty-one million, one hundred thirty-three thousand, twenty-one".