12121212021 has 8 divisors (see below), whose sum is σ = 16213251840. Its totient is φ = 8054990112.

The previous prime is 12121211953. The next prime is 12121212067. The reversal of 12121212021 is 12021212121.

12121212021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12121212021 - 2¹⁸ = 12120949877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121212121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6453381 + ... + 6455258.

It is an arithmetic number, because the mean of its divisors is an integer number (2026656480).

Almost surely, 2^12121212021 is an apocalyptic number.

It is an amenable number.

12121212021 is a deficient number, since it is larger than the sum of its proper divisors (4092039819).

12121212021 is a wasteful number, since it uses less digits than its factorization.

12121212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12908955.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12121212021 its reverse (12021212121), we get a palindrome (24142424142).

The spelling of 12121212021 in words is "twelve billion, one hundred twenty-one million, two hundred twelve thousand, twenty-one".