20342221221 has 16 divisors (see below), whose sum is σ = 31000579200. Its totient is φ = 11623035648.

The previous prime is 20342221201. The next prime is 20342221243. The reversal of 20342221221 is 12212224302.

It is not a de Polignac number, because 20342221221 - 2⁷ = 20342221093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342221201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219625 + ... + 298193.

It is an arithmetic number, because the mean of its divisors is an integer number (1937536200).

Almost surely, 2^20342221221 is an apocalyptic number.

20342221221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20342221221 is a deficient number, since it is larger than the sum of its proper divisors (10658357979).

20342221221 is a wasteful number, since it uses less digits than its factorization.

20342221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90908.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20342221221 its reverse (12212224302), we get a palindrome (32554445523).

The spelling of 20342221221 in words is "twenty billion, three hundred forty-two million, two hundred twenty-one thousand, two hundred twenty-one".