12021022121 has 8 divisors (see below), whose sum is σ = 12210233544. Its totient is φ = 11833187200.

The previous prime is 12021022103. The next prime is 12021022127. The reversal of 12021022121 is 12122012021.

It can be written as a sum of positive squares in 4 ways, for example, as 3149454400 + 8871567721 = 56120^2 + 94189^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12021022121 - 2¹⁸ = 12020759977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021022096 and 12021022105.

It is not an unprimeable number, because it can be changed into a prime (12021022127) 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, 326516 + ... + 361461.

It is an arithmetic number, because the mean of its divisors is an integer number (1526279193).

Almost surely, 2^12021022121 is an apocalyptic number.

It is an amenable number.

12021022121 is a deficient number, since it is larger than the sum of its proper divisors (189211423).

12021022121 is a wasteful number, since it uses less digits than its factorization.

12021022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688251.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12021022121 its reverse (12122012021), we get a palindrome (24143034142).

The spelling of 12021022121 in words is "twelve billion, twenty-one million, twenty-two thousand, one hundred twenty-one".