212122153 has 4 divisors (see below), whose sum is σ = 219436740. Its totient is φ = 204807568.

The previous prime is 212122129. The next prime is 212122177. The reversal of 212122153 is 351221212.

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

It is an interprime number because it is at equal distance from previous prime (212122129) and next prime (212122177).

It can be written as a sum of positive squares in 2 ways, for example, as 100861849 + 111260304 = 10043^2 + 10548^2 .

It is a cyclic number.

It is not a de Polignac number, because 212122153 - 2⁵ = 212122121 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 212122153.

It is not an unprimeable number, because it can be changed into a prime (212122853) 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 3 ways as a sum of consecutive naturals, for example, 3657250 + ... + 3657307.

It is an arithmetic number, because the mean of its divisors is an integer number (54859185).

Almost surely, 2^212122153 is an apocalyptic number.

It is an amenable number.

212122153 is a deficient number, since it is larger than the sum of its proper divisors (7314587).

212122153 is an equidigital number, since it uses as much as digits as its factorization.

212122153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7314586.

The product of its digits is 240, while the sum is 19.

The square root of 212122153 is about 14564.4139257301. The cubic root of 212122153 is about 596.3876966782.

Adding to 212122153 its reverse (351221212), we get a palindrome (563343365).

The spelling of 212122153 in words is "two hundred twelve million, one hundred twenty-two thousand, one hundred fifty-three".