12102031021 has 4 divisors (see below), whose sum is σ = 12102264000. Its totient is φ = 12101798044.

The previous prime is 12102030991. The next prime is 12102031037. The reversal of 12102031021 is 12013020121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12102031021 - 2¹¹ = 12102028973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102030992 and 12102031010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102031421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780 + ... + 155578.

It is an arithmetic number, because the mean of its divisors is an integer number (3025566000).

Almost surely, 2^12102031021 is an apocalyptic number.

It is an amenable number.

12102031021 is a deficient number, since it is larger than the sum of its proper divisors (232979).

12102031021 is an equidigital number, since it uses as much as digits as its factorization.

12102031021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232978.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 12102031021 its reverse (12013020121), we get a palindrome (24115051142).

The spelling of 12102031021 in words is "twelve billion, one hundred two million, thirty-one thousand, twenty-one".