10111211010121 has 4 divisors (see below), whose sum is σ = 10888996472452. Its totient is φ = 9333425547792.

The previous prime is 10111211010107. The next prime is 10111211010133. The reversal of 10111211010121 is 12101011211101.

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 724309932096 + 9386901078025 = 851064^2 + 3063805^2 .

It is a cyclic number.

It is not a de Polignac number, because 10111211010121 - 2⁷ = 10111211009993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 777785462317 = 10111211010121 / (1 + 0 + 1 + 1 + 1 + 2 + 1 + 1 + 0 + 1 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10111211010151) 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, 388892731146 + ... + 388892731171.

It is an arithmetic number, because the mean of its divisors is an integer number (2722249118113).

Almost surely, 2^{10111211010121} is an apocalyptic number.

It is an amenable number.

10111211010121 is a deficient number, since it is larger than the sum of its proper divisors (777785462331).

10111211010121 is an equidigital number, since it uses as much as digits as its factorization.

10111211010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777785462330.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 10111211010121 its reverse (12101011211101), we get a palindrome (22212222221222).

The spelling of 10111211010121 in words is "ten trillion, one hundred eleven billion, two hundred eleven million, ten thousand, one hundred twenty-one".