10202121212111 has 4 divisors (see below), whose sum is σ = 10802245989312. Its totient is φ = 9601996434912.

The previous prime is 10202121212027. The next prime is 10202121212119. The reversal of 10202121212111 is 11121212120201.

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

It is a cyclic number.

It is not a de Polignac number, because 10202121212111 - 2¹⁴ = 10202121195727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 600124777183 = 10202121212111 / (1 + 0 + 2 + 0 + 2 + 1 + 2 + 1 + 2 + 1 + 2 + 1 + 1 + 1).

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 10202121212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202121212119) 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, 300062388575 + ... + 300062388608.

It is an arithmetic number, because the mean of its divisors is an integer number (2700561497328).

Almost surely, 2^{10202121212111} is an apocalyptic number.

10202121212111 is a deficient number, since it is larger than the sum of its proper divisors (600124777201).

10202121212111 is an equidigital number, since it uses as much as digits as its factorization.

10202121212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600124777200.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 10202121212111 its reverse (11121212120201), we get a palindrome (21323333332312).

The spelling of 10202121212111 in words is "ten trillion, two hundred two billion, one hundred twenty-one million, two hundred twelve thousand, one hundred eleven".