221010101020 has 48 divisors (see below), whose sum is σ = 488589171840. Its totient is φ = 83744248896.

The previous prime is 221010101017. The next prime is 221010101027. The reversal of 221010101020 is 20101010122.

221010101020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 221010100988 and 221010101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221010101027) 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 15 ways as a sum of consecutive naturals, for example, 8941599 + ... + 8966281.

It is an arithmetic number, because the mean of its divisors is an integer number (10178941080).

Almost surely, 2^221010101020 is an apocalyptic number.

221010101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221010101020 is an abundant number, since it is smaller than the sum of its proper divisors (267579070820).

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

221010101020 is a wasteful number, since it uses less digits than its factorization.

221010101020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48274 (or 48272 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221010101020 its reverse (20101010122), we get a palindrome (241111111142).

The spelling of 221010101020 in words is "two hundred twenty-one billion, ten million, one hundred one thousand, twenty".