30120221220 has 24 divisors (see below), whose sum is σ = 84336619584. Its totient is φ = 8032058976.

The previous prime is 30120221167. The next prime is 30120221227. The reversal of 30120221220 is 2212202103.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 30120221220.

It is not an unprimeable number, because it can be changed into a prime (30120221227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251001784 + ... + 251001903.

It is an arithmetic number, because the mean of its divisors is an integer number (3514025816).

Almost surely, 2^30120221220 is an apocalyptic number.

30120221220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30120221220 is an abundant number, since it is smaller than the sum of its proper divisors (54216398364).

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

30120221220 is a wasteful number, since it uses less digits than its factorization.

30120221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502003699 (or 502003697 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 30120221220 its reverse (2212202103), we get a palindrome (32332423323).

It can be divided in two parts, 30120221 and 220, that added together give a triangular number (30120441 = T₇₇₆₁).

The spelling of 30120221220 in words is "thirty billion, one hundred twenty million, two hundred twenty-one thousand, two hundred twenty".