221220020211012 has 36 divisors (see below), whose sum is σ = 564731635762476. Its totient is φ = 73009907659200.

The previous prime is 221220020210989. The next prime is 221220020211013. The reversal of 221220020211012 is 210112020022122.

It is a happy number.

221220020211012 is a `hidden beast` number, since 221 + 2 + 200 + 20 + 211 + 0 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 158739437465856 + 62480582745156 = 12599184^2 + 7904466^2 .

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 not an unprimeable number, because it can be changed into a prime (221220020211013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30420791223 + ... + 30420798494.

It is an arithmetic number, because the mean of its divisors is an integer number (15686989882291).

Almost surely, 2^{221220020211012} is an apocalyptic number.

It is an amenable number.

221220020211012 is an abundant number, since it is smaller than the sum of its proper divisors (343511615551464).

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

221220020211012 is a wasteful number, since it uses less digits than its factorization.

221220020211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60841589828 (or 60841589823 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221220020211012 its reverse (210112020022122), we get a palindrome (431332040233134).

The spelling of 221220020211012 in words is "two hundred twenty-one trillion, two hundred twenty billion, twenty million, two hundred eleven thousand, twelve".