1020221100221 has 4 divisors (see below), whose sum is σ = 1021924308000. Its totient is φ = 1018517892444.

The previous prime is 1020221100191. The next prime is 1020221100233. The reversal of 1020221100221 is 1220011220201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020221100221 is a prime.

It is a super-2 number, since 2×1020221100221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020221100196 and 1020221100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020221103221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851602991 + ... + 851604188.

It is an arithmetic number, because the mean of its divisors is an integer number (255481077000).

Almost surely, 2^{1020221100221} is an apocalyptic number.

It is an amenable number.

1020221100221 is a deficient number, since it is larger than the sum of its proper divisors (1703207779).

1020221100221 is an equidigital number, since it uses as much as digits as its factorization.

1020221100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703207778.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1020221100221 its reverse (1220011220201), we get a palindrome (2240232320422).

The spelling of 1020221100221 in words is "one trillion, twenty billion, two hundred twenty-one million, one hundred thousand, two hundred twenty-one".