212215251 has 8 divisors (see below), whose sum is σ = 286535680. Its totient is φ = 139685832.

The previous prime is 212215247. The next prime is 212215253. The reversal of 212215251 is 152512212.

212215251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 212215251 - 2² = 212215247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212215253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447475 + ... + 447948.

It is an arithmetic number, because the mean of its divisors is an integer number (35816960).

Almost surely, 2^212215251 is an apocalyptic number.

212215251 is a deficient number, since it is larger than the sum of its proper divisors (74320429).

212215251 is an equidigital number, since it uses as much as digits as its factorization.

212215251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895505.

The product of its digits is 400, while the sum is 21.

The square root of 212215251 is about 14567.6096529252. The cubic root of 212215251 is about 596.4749331758.

Adding to 212215251 its reverse (152512212), we get a palindrome (364727463).

The spelling of 212215251 in words is "two hundred twelve million, two hundred fifteen thousand, two hundred fifty-one".