212403155 has 8 divisors (see below), whose sum is σ = 255387600. Its totient is φ = 169586656.

The previous prime is 212403119. The next prime is 212403157. The reversal of 212403155 is 551304212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212403155 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212403155.

It is not an unprimeable number, because it can be changed into a prime (212403157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39185 + ... + 44274.

It is an arithmetic number, because the mean of its divisors is an integer number (31923450).

Almost surely, 2^212403155 is an apocalyptic number.

212403155 is a deficient number, since it is larger than the sum of its proper divisors (42984445).

212403155 is an equidigital number, since it uses as much as digits as its factorization.

212403155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83973.

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

The square root of 212403155 is about 14574.0576024661. The cubic root of 212403155 is about 596.6509289497.

Adding to 212403155 its reverse (551304212), we get a palindrome (763707367).

The spelling of 212403155 in words is "two hundred twelve million, four hundred three thousand, one hundred fifty-five".