210042120111 has 4 divisors (see below), whose sum is σ = 280056160152. Its totient is φ = 140028080072.

The previous prime is 210042120103. The next prime is 210042120149. The reversal of 210042120111 is 111021240012.

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 210042120111 - 2³ = 210042120103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210042120311) 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, 35007020016 + ... + 35007020021.

It is an arithmetic number, because the mean of its divisors is an integer number (70014040038).

Almost surely, 2^210042120111 is an apocalyptic number.

210042120111 is a deficient number, since it is larger than the sum of its proper divisors (70014040041).

210042120111 is an equidigital number, since it uses as much as digits as its factorization.

210042120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70014040040.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210042120111 its reverse (111021240012), we get a palindrome (321063360123).

The spelling of 210042120111 in words is "two hundred ten billion, forty-two million, one hundred twenty thousand, one hundred eleven".