212521045 has 8 divisors (see below), whose sum is σ = 278209440. Its totient is φ = 154560720.

The previous prime is 212521037. The next prime is 212521051. The reversal of 212521045 is 540125212.

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

It is not a de Polignac number, because 212521045 - 2³ = 212521037 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1931955 + ... + 1932064.

It is an arithmetic number, because the mean of its divisors is an integer number (34776180).

Almost surely, 2^212521045 is an apocalyptic number.

It is an amenable number.

212521045 is a deficient number, since it is larger than the sum of its proper divisors (65688395).

212521045 is a wasteful number, since it uses less digits than its factorization.

212521045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864035.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 212521045 is about 14578.1015567872. The cubic root of 212521045 is about 596.7612948065.

Adding to 212521045 its reverse (540125212), we get a palindrome (752646257).

The spelling of 212521045 in words is "two hundred twelve million, five hundred twenty-one thousand, forty-five".