220100111001021 has 4 divisors (see below), whose sum is σ = 293466814668032. Its totient is φ = 146733407334012.

The previous prime is 220100111001013. The next prime is 220100111001103. The reversal of 220100111001021 is 120100111001022.

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 not a de Polignac number, because 220100111001021 - 2³ = 220100111001013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220100111000988 and 220100111001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220100111701021) 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, 36683351833501 + ... + 36683351833506.

It is an arithmetic number, because the mean of its divisors is an integer number (73366703667008).

Almost surely, 2^{220100111001021} is an apocalyptic number.

It is an amenable number.

220100111001021 is a deficient number, since it is larger than the sum of its proper divisors (73366703667011).

220100111001021 is an equidigital number, since it uses as much as digits as its factorization.

220100111001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73366703667010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 220100111001021 its reverse (120100111001022), we get a palindrome (340200222002043).

Subtracting from 220100111001021 its reverse (120100111001022), we obtain a palindrome (99999999999999).

It can be divided in two parts, 22010011 and 1001021, that added together give a palindrome (23011032).

The spelling of 220100111001021 in words is "two hundred twenty trillion, one hundred billion, one hundred eleven million, one thousand, twenty-one".