221021102212020 has 144 divisors (see below), whose sum is σ = 731416057025472. Its totient is φ = 53578152606720.

The previous prime is 221021102212007. The next prime is 221021102212021. The reversal of 221021102212020 is 20212201120122.

It is a happy number.

221021102212020 is a `hidden beast` number, since 2 + 210 + 21 + 10 + 221 + 202 + 0 = 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 = 221021102211984 and 221021102212002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021102212021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36306604 + ... + 41954876.

It is an arithmetic number, because the mean of its divisors is an integer number (5079278173788).

Almost surely, 2^{221021102212020} is an apocalyptic number.

221021102212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021102212020 is an abundant number, since it is smaller than the sum of its proper divisors (510394954813452).

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

221021102212020 is a wasteful number, since it uses less digits than its factorization.

221021102212020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5668062 (or 5668057 counting only the distinct ones).

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

Adding to 221021102212020 its reverse (20212201120122), we get a palindrome (241233303332142).

The spelling of 221021102212020 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred two million, two hundred twelve thousand, twenty".