10202120111 has 4 divisors (see below), whose sum is σ = 10202422392. Its totient is φ = 10201817832.

The previous prime is 10202120099. The next prime is 10202120141. The reversal of 10202120111 is 11102120201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11102120201 = 14057 ⋅789793.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10202120111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10202120092 and 10202120101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202120141) 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, 93080 + ... + 170493.

It is an arithmetic number, because the mean of its divisors is an integer number (2550605598).

Almost surely, 2^10202120111 is an apocalyptic number.

10202120111 is a deficient number, since it is larger than the sum of its proper divisors (302281).

10202120111 is an equidigital number, since it uses as much as digits as its factorization.

10202120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302280.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10202120111 its reverse (11102120201), we get a palindrome (21304240312).

The spelling of 10202120111 in words is "ten billion, two hundred two million, one hundred twenty thousand, one hundred eleven".