220021222120021 has 4 divisors (see below), whose sum is σ = 251452825280032. Its totient is φ = 188589618960012.

The previous prime is 220021222119971. The next prime is 220021222120031. The reversal of 220021222120021 is 120021222120022.

220021222120021 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 220021222120021 - 2¹³ = 220021222111829 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 (220021222120031) 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, 15715801579995 + ... + 15715801580008.

It is an arithmetic number, because the mean of its divisors is an integer number (62863206320008).

Almost surely, 2^{220021222120021} is an apocalyptic number.

It is an amenable number.

220021222120021 is a deficient number, since it is larger than the sum of its proper divisors (31431603160011).

220021222120021 is an equidigital number, since it uses as much as digits as its factorization.

220021222120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31431603160010.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 220021222120021 its reverse (120021222120022), we get a palindrome (340042444240043).

Subtracting from 220021222120021 its reverse (120021222120022), we obtain a palindrome (99999999999999).

The spelling of 220021222120021 in words is "two hundred twenty trillion, twenty-one billion, two hundred twenty-two million, one hundred twenty thousand, twenty-one".