12021212021 has 16 divisors (see below), whose sum is σ = 14886125184. Its totient is φ = 9452925504.

The previous prime is 12021212009. The next prime is 12021212029.

12021212021 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12021212021 - 2²² = 12017017717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021211987 and 12021212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021212029) 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, 390386 + ... + 420051.

It is an arithmetic number, because the mean of its divisors is an integer number (930382824).

Almost surely, 2^12021212021 is an apocalyptic number.

It is an amenable number.

12021212021 is a deficient number, since it is larger than the sum of its proper divisors (2864913163).

12021212021 is a wasteful number, since it uses less digits than its factorization.

12021212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810620.

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

The spelling of 12021212021 in words is "twelve billion, twenty-one million, two hundred twelve thousand, twenty-one".