12501211021 has 8 divisors (see below), whose sum is σ = 13464209304. Its totient is φ = 11538408000.

The previous prime is 12501210971. The next prime is 12501211031. The reversal of 12501211021 is 12011210521.

12501211021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 485982025 + 12015228996 = 22045^2 + 109614^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12501211021 - 2²⁷ = 12366993293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12501210986 and 12501211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12501211031) 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, 101271 + ... + 187771.

It is an arithmetic number, because the mean of its divisors is an integer number (1683026163).

Almost surely, 2^12501211021 is an apocalyptic number.

It is an amenable number.

12501211021 is a deficient number, since it is larger than the sum of its proper divisors (962998283).

12501211021 is a wasteful number, since it uses less digits than its factorization.

12501211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97631.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 12501211021 its reverse (12011210521), we get a palindrome (24512421542).

The spelling of 12501211021 in words is "twelve billion, five hundred one million, two hundred eleven thousand, twenty-one".