212122505 has 16 divisors (see below), whose sum is σ = 294597120. Its totient is φ = 143612352.

The previous prime is 212122459. The next prime is 212122541. The reversal of 212122505 is 505221212.

It is a happy number.

212122505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 212122505 - 2⁸ = 212122249 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, 35594 + ... + 41123.

It is an arithmetic number, because the mean of its divisors is an integer number (18412320).

Almost surely, 2^212122505 is an apocalyptic number.

It is an amenable number.

212122505 is a deficient number, since it is larger than the sum of its proper divisors (82474615).

212122505 is an equidigital number, since it uses as much as digits as its factorization.

212122505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76808.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 212122505 is about 14564.4260099738. The cubic root of 212122505 is about 596.3880265642.

Adding to 212122505 its reverse (505221212), we get a palindrome (717343717).

The spelling of 212122505 in words is "two hundred twelve million, one hundred twenty-two thousand, five hundred five".