20342120221 has 12 divisors (see below), whose sum is σ = 20996824212. Its totient is φ = 19707078528.

The previous prime is 20342120203. The next prime is 20342120251. The reversal of 20342120221 is 12202124302.

It can be written as a sum of positive squares in 6 ways, for example, as 3367225 + 20338752996 = 1835^2 + 142614^2 .

It is not a de Polignac number, because 20342120221 - 2¹⁹ = 20341595933 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 (20342120251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 287091 + ... + 350863.

It is an arithmetic number, because the mean of its divisors is an integer number (1749735351).

Almost surely, 2^20342120221 is an apocalyptic number.

It is an amenable number.

20342120221 is a deficient number, since it is larger than the sum of its proper divisors (654703991).

20342120221 is an equidigital number, since it uses as much as digits as its factorization.

20342120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64080 (or 64043 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20342120221 its reverse (12202124302), we get a palindrome (32544244523).

The spelling of 20342120221 in words is "twenty billion, three hundred forty-two million, one hundred twenty thousand, two hundred twenty-one".