821250220 has 24 divisors (see below), whose sum is σ = 1971000864. Its totient is φ = 281571456.

The previous prime is 821250181. The next prime is 821250247. The reversal of 821250220 is 22052128.

It is a junction number, because it is equal to n+sod(n) for n = 821250191 and 821250200.

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, 2932897 + ... + 2933176.

It is an arithmetic number, because the mean of its divisors is an integer number (82125036).

Almost surely, 2^821250220 is an apocalyptic number.

It is an amenable number.

821250220 is an abundant number, since it is smaller than the sum of its proper divisors (1149750644).

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

821250220 is a wasteful number, since it uses less digits than its factorization.

821250220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5866089 (or 5866087 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 821250220 is about 28657.4636002560. The cubic root of 821250220 is about 936.4656092282.

The spelling of 821250220 in words is "eight hundred twenty-one million, two hundred fifty thousand, two hundred twenty".