821225670 has 16 divisors (see below), whose sum is σ = 1970941680. Its totient is φ = 218993504.

The previous prime is 821225659. The next prime is 821225707. The reversal of 821225670 is 76522128.

821225670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13687065 + ... + 13687124.

It is an arithmetic number, because the mean of its divisors is an integer number (123183855).

Almost surely, 2^821225670 is an apocalyptic number.

821225670 is an abundant number, since it is smaller than the sum of its proper divisors (1149716010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821225670 is a wasteful number, since it uses less digits than its factorization.

821225670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27374199.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 821225670 is about 28657.0352618689. The cubic root of 821225670 is about 936.4562777402.

Adding to 821225670 its reverse (76522128), we get a palindrome (897747798).

The spelling of 821225670 in words is "eight hundred twenty-one million, two hundred twenty-five thousand, six hundred seventy".