30121220 has 24 divisors (see below), whose sum is σ = 63370944. Its totient is φ = 12026336.

The previous prime is 30121207. The next prime is 30121241. The reversal of 30121220 is 2212103.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13847 + ... + 15873.

It is an arithmetic number, because the mean of its divisors is an integer number (2640456).

Almost surely, 2^30121220 is an apocalyptic number.

It is an amenable number.

30121220 is an abundant number, since it is smaller than the sum of its proper divisors (33249724).

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

30121220 is a wasteful number, since it uses less digits than its factorization.

30121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779 (or 2777 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 30121220 is about 5488.2802406583. The cubic root of 30121220 is about 311.1411978650.

Adding to 30121220 its reverse (2212103), we get a palindrome (32333323).

It can be divided in two parts, 30121 and 220, that multiplied together give a triangular number (6626620 = T₃₆₄₀).

The spelling of 30121220 in words is "thirty million, one hundred twenty-one thousand, two hundred twenty".