210120111111 has 8 divisors (see below), whose sum is σ = 280186057984. Its totient is φ = 140067119160.

The previous prime is 210120111109. The next prime is 210120111133. The reversal of 210120111111 is 111111021012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 210120111111 - 2¹ = 210120111109 is a prime.

It is a super-2 number, since 2×210120111111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120111011) 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, 3200821 + ... + 3265806.

It is an arithmetic number, because the mean of its divisors is an integer number (35023257248).

Almost surely, 2^210120111111 is an apocalyptic number.

210120111111 is a deficient number, since it is larger than the sum of its proper divisors (70065946873).

210120111111 is a wasteful number, since it uses less digits than its factorization.

210120111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6477461.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 210120111111 its reverse (111111021012), we get a palindrome (321231132123).

Subtracting from 210120111111 its reverse (111111021012), we obtain a palindrome (99009090099).

The spelling of 210120111111 in words is "two hundred ten billion, one hundred twenty million, one hundred eleven thousand, one hundred eleven".