12015032220 has 36 divisors (see below), whose sum is σ = 36445598280. Its totient is φ = 3204008544.

The previous prime is 12015032209. The next prime is 12015032233. The reversal of 12015032220 is 2223051021.

12015032220 is a `hidden beast` number, since 120 + 1 + 503 + 22 + 20 = 666.

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 = 12015032193 and 12015032202.

It is a congruent number.

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, 33374910 + ... + 33375269.

It is an arithmetic number, because the mean of its divisors is an integer number (1012377730).

Almost surely, 2^12015032220 is an apocalyptic number.

12015032220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12015032220 is an abundant number, since it is smaller than the sum of its proper divisors (24430566060).

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

12015032220 is a wasteful number, since it uses less digits than its factorization.

12015032220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66750194 (or 66750189 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 12015032220 its reverse (2223051021), we get a palindrome (14238083241).

The spelling of 12015032220 in words is "twelve billion, fifteen million, thirty-two thousand, two hundred twenty".