210240055 has 4 divisors (see below), whose sum is σ = 252288072. Its totient is φ = 168192040.

The previous prime is 210240049. The next prime is 210240059. The reversal of 210240055 is 550042012.

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

It is not a de Polignac number, because 210240055 - 2⁹ = 210239543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210240059) 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, 21024001 + ... + 21024010.

It is an arithmetic number, because the mean of its divisors is an integer number (63072018).

Almost surely, 2^210240055 is an apocalyptic number.

210240055 is a deficient number, since it is larger than the sum of its proper divisors (42048017).

210240055 is an equidigital number, since it uses as much as digits as its factorization.

210240055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42048016.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 210240055 is about 14499.6570649102. The cubic root of 210240055 is about 594.6185960439.

Adding to 210240055 its reverse (550042012), we get a palindrome (760282067).

The spelling of 210240055 in words is "two hundred ten million, two hundred forty thousand, fifty-five".