213242155 has 8 divisors (see below), whose sum is σ = 292446432. Its totient is φ = 146223168.

The previous prime is 213242147. The next prime is 213242179. The reversal of 213242155 is 551242312.

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

It is not a de Polignac number, because 213242155 - 2³ = 213242147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3046282 + ... + 3046351.

It is an arithmetic number, because the mean of its divisors is an integer number (36555804).

Almost surely, 2^213242155 is an apocalyptic number.

213242155 is a deficient number, since it is larger than the sum of its proper divisors (79204277).

213242155 is an equidigital number, since it uses as much as digits as its factorization.

213242155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6092645.

The product of its digits is 2400, while the sum is 25.

The square root of 213242155 is about 14602.8132563558. The cubic root of 213242155 is about 597.4354942821.

Adding to 213242155 its reverse (551242312), we get a palindrome (764484467).

The spelling of 213242155 in words is "two hundred thirteen million, two hundred forty-two thousand, one hundred fifty-five".