221021201020 has 24 divisors (see below), whose sum is σ = 472901968224. Its totient is φ = 86740395456.

The previous prime is 221021201003. The next prime is 221021201039. The reversal of 221021201020 is 20102120122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104254224 + ... + 104256343.

It is an arithmetic number, because the mean of its divisors is an integer number (19704248676).

Almost surely, 2^221021201020 is an apocalyptic number.

221021201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021201020 is an abundant number, since it is smaller than the sum of its proper divisors (251880767204).

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

221021201020 is a wasteful number, since it uses less digits than its factorization.

221021201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208510629 (or 208510627 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221021201020 its reverse (20102120122), we get a palindrome (241123321142).

The spelling of 221021201020 in words is "two hundred twenty-one billion, twenty-one million, two hundred one thousand, twenty".