10212121111121 has 4 divisors (see below), whose sum is σ = 10226524667700. Its totient is φ = 10197717554544.

The previous prime is 10212121111039. The next prime is 10212121111151. The reversal of 10212121111121 is 12111112121201.

10212121111121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 714870250000 + 9497250861121 = 845500^2 + 3081761^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212121111121 - 2¹⁴ = 10212121094737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10212121111121.

It is not an unprimeable number, because it can be changed into a prime (10212121111151) 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, 7201777226 + ... + 7201778643.

It is an arithmetic number, because the mean of its divisors is an integer number (2556631166925).

Almost surely, 2^{10212121111121} is an apocalyptic number.

It is an amenable number.

10212121111121 is a deficient number, since it is larger than the sum of its proper divisors (14403556579).

10212121111121 is an equidigital number, since it uses as much as digits as its factorization.

10212121111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14403556578.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 10212121111121 its reverse (12111112121201), we get a palindrome (22323233232322).

The spelling of 10212121111121 in words is "ten trillion, two hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty-one".