30221818 has 32 divisors (see below), whose sum is σ = 55131840. Its totient is φ = 12245760.

The previous prime is 30221771. The next prime is 30221827. The reversal of 30221818 is 81812203.

It is a junction number, because it is equal to n+sod(n) for n = 30221792 and 30221801.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4980 + ... + 9232.

It is an arithmetic number, because the mean of its divisors is an integer number (1722870).

Almost surely, 2^30221818 is an apocalyptic number.

30221818 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

30221818 is a deficient number, since it is larger than the sum of its proper divisors (24910022).

30221818 is a wasteful number, since it uses less digits than its factorization.

30221818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4302.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 30221818 is about 5497.4374030088. The cubic root of 30221818 is about 311.4871931642.

The spelling of 30221818 in words is "thirty million, two hundred twenty-one thousand, eight hundred eighteen".