210243155 has 8 divisors (see below), whose sum is σ = 253224384. Its totient is φ = 167572800.

The previous prime is 210243133. The next prime is 210243157. The reversal of 210243155 is 551342012.

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

It is not a de Polignac number, because 210243155 - 2¹² = 210239059 is a prime.

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 210243155.

It is not an unprimeable number, because it can be changed into a prime (210243157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76226 + ... + 78935.

It is an arithmetic number, because the mean of its divisors is an integer number (31653048).

Almost surely, 2^210243155 is an apocalyptic number.

210243155 is a deficient number, since it is larger than the sum of its proper divisors (42981229).

210243155 is a wasteful number, since it uses less digits than its factorization.

210243155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155437.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 210243155 is about 14499.7639635961. The cubic root of 210243155 is about 594.6215185898.

Adding to 210243155 its reverse (551342012), we get a palindrome (761585167).

The spelling of 210243155 in words is "two hundred ten million, two hundred forty-three thousand, one hundred fifty-five".