220021323012 has 72 divisors (see below), whose sum is σ = 571551435000. Its totient is φ = 71322900480.

The previous prime is 220021322999. The next prime is 220021323019. The reversal of 220021323012 is 210323120022.

220021323012 is a `hidden beast` number, since 220 + 0 + 213 + 230 + 1 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26048023236 + 193973299776 = 161394^2 + 440424^2 .

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

It is not an unprimeable number, because it can be changed into a prime (220021323019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223864 + ... + 700112.

It is an arithmetic number, because the mean of its divisors is an integer number (7938214375).

Almost surely, 2^220021323012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220021323012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285775717500).

220021323012 is an abundant number, since it is smaller than the sum of its proper divisors (351530111988).

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

220021323012 is a wasteful number, since it uses less digits than its factorization.

220021323012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476613 (or 476608 counting only the distinct ones).

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

Adding to 220021323012 its reverse (210323120022), we get a palindrome (430344443034).

The spelling of 220021323012 in words is "two hundred twenty billion, twenty-one million, three hundred twenty-three thousand, twelve".