213432155 has 4 divisors (see below), whose sum is σ = 256118592. Its totient is φ = 170745720.

The previous prime is 213432119. The next prime is 213432221. The reversal of 213432155 is 551234312.

It is a happy number.

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

It is not a de Polignac number, because 213432155 - 2⁸ = 213431899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21343211 + ... + 21343220.

It is an arithmetic number, because the mean of its divisors is an integer number (64029648).

Almost surely, 2^213432155 is an apocalyptic number.

213432155 is a deficient number, since it is larger than the sum of its proper divisors (42686437).

213432155 is an equidigital number, since it uses as much as digits as its factorization.

213432155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42686436.

The product of its digits is 3600, while the sum is 26.

The square root of 213432155 is about 14609.3174036298. The cubic root of 213432155 is about 597.6128811081.

Adding to 213432155 its reverse (551234312), we get a palindrome (764666467).

The spelling of 213432155 in words is "two hundred thirteen million, four hundred thirty-two thousand, one hundred fifty-five".