12121032021 has 16 divisors (see below), whose sum is σ = 18660561024. Its totient is φ = 6854897664.

The previous prime is 12121032017. The next prime is 12121032097. The reversal of 12121032021 is 12023012121.

It is not a de Polignac number, because 12121032021 - 2² = 12121032017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121033021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2973180 + ... + 2977253.

It is an arithmetic number, because the mean of its divisors is an integer number (1166285064).

Almost surely, 2^12121032021 is an apocalyptic number.

It is an amenable number.

12121032021 is a deficient number, since it is larger than the sum of its proper divisors (6539529003).

12121032021 is an equidigital number, since it uses as much as digits as its factorization.

12121032021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5950540.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 12121032021 its reverse (12023012121), we get a palindrome (24144044142).

The spelling of 12121032021 in words is "twelve billion, one hundred twenty-one million, thirty-two thousand, twenty-one".