821252930 has 16 divisors (see below), whose sum is σ = 1525941504. Its totient is φ = 317904240.

The previous prime is 821252921. The next prime is 821252951. The reversal of 821252930 is 39252128.

It is a happy number.

It is a Curzon 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, 1324292 + ... + 1324911.

It is an arithmetic number, because the mean of its divisors is an integer number (95371344).

Almost surely, 2^821252930 is an apocalyptic number.

821252930 is a deficient number, since it is larger than the sum of its proper divisors (704688574).

821252930 is a wasteful number, since it uses less digits than its factorization.

821252930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649241.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 821252930 is about 28657.5108828384. The cubic root of 821252930 is about 936.4666392915.

The spelling of 821252930 in words is "eight hundred twenty-one million, two hundred fifty-two thousand, nine hundred thirty".