211221201102020 has 12 divisors (see below), whose sum is σ = 443564522314284. Its totient is φ = 84488480440800.

The previous prime is 211221201102001. The next prime is 211221201102083. The reversal of 211221201102020 is 20201102122112.

It can be written as a sum of positive squares in 2 ways, for example, as 89857355993344 + 121363845108676 = 9479312^2 + 11016526^2 .

It is a super-2 number, since 2×211221201102020² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211221201102020.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5280530027531 + ... + 5280530027570.

It is an arithmetic number, because the mean of its divisors is an integer number (36963710192857).

Almost surely, 2^{211221201102020} is an apocalyptic number.

211221201102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221201102020 is an abundant number, since it is smaller than the sum of its proper divisors (232343321212264).

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

211221201102020 is a wasteful number, since it uses less digits than its factorization.

211221201102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561060055110 (or 10561060055108 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211221201102020 its reverse (20201102122112), we get a palindrome (231422303224132).

The spelling of 211221201102020 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred one million, one hundred two thousand, twenty".