30221321220 has 36 divisors (see below), whose sum is σ = 91671341580. Its totient is φ = 8059018944.

The previous prime is 30221321177. The next prime is 30221321233. The reversal of 30221321220 is 2212312203.

30221321220 is a `hidden beast` number, since 302 + 21 + 321 + 2 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14801642244 + 15419678976 = 121662^2 + 124176^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 30221321193 and 30221321202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83947935 + ... + 83948294.

It is an arithmetic number, because the mean of its divisors is an integer number (2546426155).

Almost surely, 2^30221321220 is an apocalyptic number.

30221321220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30221321220 is an abundant number, since it is smaller than the sum of its proper divisors (61450020360).

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

30221321220 is a wasteful number, since it uses less digits than its factorization.

30221321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167896244 (or 167896239 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 30221321220 its reverse (2212312203), we get a palindrome (32433633423).

The spelling of 30221321220 in words is "thirty billion, two hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty".