30193821 has 12 divisors (see below), whose sum is σ = 49843872. Its totient is φ = 17253576.

The previous prime is 30193817. The next prime is 30193829. The reversal of 30193821 is 12839103.

It is not a de Polignac number, because 30193821 - 2² = 30193817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30193829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239571 + ... + 239696.

It is an arithmetic number, because the mean of its divisors is an integer number (4153656).

Almost surely, 2^30193821 is an apocalyptic number.

It is an amenable number.

30193821 is a deficient number, since it is larger than the sum of its proper divisors (19650051).

30193821 is a wasteful number, since it uses less digits than its factorization.

30193821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479280 (or 479277 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 30193821 is about 5494.8904447678. The cubic root of 30193821 is about 311.3909778931.

The spelling of 30193821 in words is "thirty million, one hundred ninety-three thousand, eight hundred twenty-one".