30220821 has 12 divisors (see below), whose sum is σ = 43915872. Its totient is φ = 20025576.

The previous prime is 30220807. The next prime is 30220847. The reversal of 30220821 is 12802203.

It is a happy number.

It is not a de Polignac number, because 30220821 - 2⁵ = 30220789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30220794 and 30220803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30220891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8551 + ... + 11556.

It is an arithmetic number, because the mean of its divisors is an integer number (3659656).

Almost surely, 2^30220821 is an apocalyptic number.

It is an amenable number.

30220821 is a deficient number, since it is larger than the sum of its proper divisors (13695051).

30220821 is a wasteful number, since it uses less digits than its factorization.

30220821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20280 (or 20277 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 30220821 is about 5497.3467236477. The cubic root of 30220821 is about 311.4837678668.

The spelling of 30220821 in words is "thirty million, two hundred twenty thousand, eight hundred twenty-one".