220102011221021 has 4 divisors (see below), whose sum is σ = 220914195764544. Its totient is φ = 219289826677500.

The previous prime is 220102011221017. The next prime is 220102011221023. The reversal of 220102011221021 is 120122110201022.

220102011221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 220102011221021 - 2² = 220102011221017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220102011221023) 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, 406092271355 + ... + 406092271896.

It is an arithmetic number, because the mean of its divisors is an integer number (55228548941136).

Almost surely, 2^{220102011221021} is an apocalyptic number.

It is an amenable number.

220102011221021 is a deficient number, since it is larger than the sum of its proper divisors (812184543523).

220102011221021 is an equidigital number, since it uses as much as digits as its factorization.

220102011221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812184543522.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 220102011221021 its reverse (120122110201022), we get a palindrome (340224121422043).

The spelling of 220102011221021 in words is "two hundred twenty trillion, one hundred two billion, eleven million, two hundred twenty-one thousand, twenty-one".