221010101010020 has 96 divisors (see below), whose sum is σ = 564872060648448. Its totient is φ = 70905304922112.

The previous prime is 221010101009993. The next prime is 221010101010031. The reversal of 221010101010020 is 20010101010122.

It is a junction number, because it is equal to n+sod(n) for n = 221010101009983 and 221010101010010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 267973772 + ... + 268797251.

It is an arithmetic number, because the mean of its divisors is an integer number (5884083965088).

Almost surely, 2^{221010101010020} is an apocalyptic number.

221010101010020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221010101010020 is an abundant number, since it is smaller than the sum of its proper divisors (343861959638428).

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

221010101010020 is a wasteful number, since it uses less digits than its factorization.

221010101010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536771229 (or 536771227 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 221010101010020 its reverse (20010101010122), we get a palindrome (241020202020142).

The spelling of 221010101010020 in words is "two hundred twenty-one trillion, ten billion, one hundred one million, ten thousand, twenty".