20420113322221 has 4 divisors (see below), whose sum is σ = 20431978584444. Its totient is φ = 20408248060000.

The previous prime is 20420113322209. The next prime is 20420113322351. The reversal of 20420113322221 is 12222331102402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15069450399721 + 5350662922500 = 3881939^2 + 2313150^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420113322221 - 2⁹ = 20420113321709 is a prime.

It is a super-3 number, since 3×20420113322221³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420113322201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5932628530 + ... + 5932631971.

It is an arithmetic number, because the mean of its divisors is an integer number (5107994646111).

Almost surely, 2^{20420113322221} is an apocalyptic number.

It is an amenable number.

20420113322221 is a deficient number, since it is larger than the sum of its proper divisors (11865262223).

20420113322221 is a wasteful number, since it uses less digits than its factorization.

20420113322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11865262222.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 20420113322221 its reverse (12222331102402), we get a palindrome (32642444424623).

The spelling of 20420113322221 in words is "twenty trillion, four hundred twenty billion, one hundred thirteen million, three hundred twenty-two thousand, two hundred twenty-one".