12103212021 has 16 divisors (see below), whose sum is σ = 17382013440. Its totient is φ = 7466361840.

The previous prime is 12103211977. The next prime is 12103212041. The reversal of 12103212021 is 12021230121.

It is not a de Polignac number, because 12103212021 - 2¹⁸ = 12102949877 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 (12103212041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2466585 + ... + 2471486.

It is an arithmetic number, because the mean of its divisors is an integer number (1086375840).

Almost surely, 2^12103212021 is an apocalyptic number.

It is an amenable number.

12103212021 is a deficient number, since it is larger than the sum of its proper divisors (5278801419).

12103212021 is a wasteful number, since it uses less digits than its factorization.

12103212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4938136.

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

Adding to 12103212021 its reverse (12021230121), we get a palindrome (24124442142).

The spelling of 12103212021 in words is "twelve billion, one hundred three million, two hundred twelve thousand, twenty-one".