215212055 has 4 divisors (see below), whose sum is σ = 258254472. Its totient is φ = 172169640.

The previous prime is 215212043. The next prime is 215212073. The reversal of 215212055 is 550212512.

215212055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 215212055 - 2¹² = 215207959 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 215212055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21521201 + ... + 21521210.

It is an arithmetic number, because the mean of its divisors is an integer number (64563618).

Almost surely, 2^215212055 is an apocalyptic number.

215212055 is a deficient number, since it is larger than the sum of its proper divisors (43042417).

215212055 is an equidigital number, since it uses as much as digits as its factorization.

215212055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43042416.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 215212055 is about 14670.1075319849. The cubic root of 215212055 is about 599.2695323522.

Adding to 215212055 its reverse (550212512), we get a palindrome (765424567).

The spelling of 215212055 in words is "two hundred fifteen million, two hundred twelve thousand, fifty-five".