212423155 has 16 divisors (see below), whose sum is σ = 291642624. Its totient is φ = 145501920.

The previous prime is 212423131. The next prime is 212423161. The reversal of 212423155 is 551324212.

It is not a de Polignac number, because 212423155 - 2⁷ = 212423027 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35404 + ... + 40966.

It is an arithmetic number, because the mean of its divisors is an integer number (18227664).

Almost surely, 2^212423155 is an apocalyptic number.

212423155 is a deficient number, since it is larger than the sum of its proper divisors (79219469).

212423155 is a wasteful number, since it uses less digits than its factorization.

212423155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6666.

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

The square root of 212423155 is about 14574.7437370267. The cubic root of 212423155 is about 596.6696553571.

Adding to 212423155 its reverse (551324212), we get a palindrome (763747367).

The spelling of 212423155 in words is "two hundred twelve million, four hundred twenty-three thousand, one hundred fifty-five".