4021221221100 has 72 divisors (see below), whose sum is σ = 12927481563920. Its totient is φ = 1072325658240.

The previous prime is 4021221221089. The next prime is 4021221221167. The reversal of 4021221221100 is 11221221204.

4021221221100 is a `hidden beast` number, since 402 + 12 + 21 + 221 + 10 + 0 = 666.

4021221221100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 744667897 + ... + 744673296.

Almost surely, 2^{4021221221100} is an apocalyptic number.

It is an amenable number.

4021221221100 is an abundant number, since it is smaller than the sum of its proper divisors (8906260342820).

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

4021221221100 is a wasteful number, since it uses less digits than its factorization.

4021221221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489341216 (or 1489341203 counting only the distinct ones).

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

Adding to 4021221221100 its reverse (11221221204), we get a palindrome (4032442442304).

The spelling of 4021221221100 in words is "four trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred".