10206661121021 has 8 divisors (see below), whose sum is σ = 10650462339264. Its totient is φ = 9762862681440.

The previous prime is 10206661121017. The next prime is 10206661121053. The reversal of 10206661121021 is 12012116660201.

10206661121021 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 a cyclic number.

It is not a de Polignac number, because 10206661121021 - 2² = 10206661121017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10206661121221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11002166 + ... + 11893736.

It is an arithmetic number, because the mean of its divisors is an integer number (1331307792408).

Almost surely, 2^{10206661121021} is an apocalyptic number.

It is an amenable number.

10206661121021 is a deficient number, since it is larger than the sum of its proper divisors (443801218243).

10206661121021 is an equidigital number, since it uses as much as digits as its factorization.

10206661121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389331.

The product of its (nonzero) digits is 1728, while the sum is 29.

Adding to 10206661121021 its reverse (12012116660201), we get a palindrome (22218777781222).

The spelling of 10206661121021 in words is "ten trillion, two hundred six billion, six hundred sixty-one million, one hundred twenty-one thousand, twenty-one".