221021201102220 has 144 divisors (see below), whose sum is σ = 721899756133920. Its totient is φ = 54531784501248.

The previous prime is 221021201102189. The next prime is 221021201102243. The reversal of 221021201102220 is 22201102120122.

It is a happy number.

221021201102220 is a `hidden beast` number, since 2 + 210 + 2 + 120 + 110 + 2 + 220 = 666.

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 = 221021201102193 and 221021201102202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 611930907 + ... + 612291986.

It is an arithmetic number, because the mean of its divisors is an integer number (5013192750930).

Almost surely, 2^{221021201102220} is an apocalyptic number.

221021201102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021201102220 is an abundant number, since it is smaller than the sum of its proper divisors (500878555031700).

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

221021201102220 is a wasteful number, since it uses less digits than its factorization.

221021201102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224222984 (or 1224222979 counting only the distinct ones).

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

Adding to 221021201102220 its reverse (22201102120122), we get a palindrome (243222303222342).

The spelling of 221021201102220 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred one million, one hundred two thousand, two hundred twenty".