20330001131221 has 4 divisors (see below), whose sum is σ = 20879460621292. Its totient is φ = 19780541641152.

The previous prime is 20330001131201. The next prime is 20330001131233. The reversal of 20330001131221 is 12213110003302.

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 18895443978321 + 1434557152900 = 4346889^2 + 1197730^2 .

It is a cyclic number.

It is not a de Polignac number, because 20330001131221 - 2¹¹ = 20330001129173 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 (20330001131201) 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, 274729744980 + ... + 274729745053.

It is an arithmetic number, because the mean of its divisors is an integer number (5219865155323).

Almost surely, 2^{20330001131221} is an apocalyptic number.

It is an amenable number.

20330001131221 is a deficient number, since it is larger than the sum of its proper divisors (549459490071).

20330001131221 is an equidigital number, since it uses as much as digits as its factorization.

20330001131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549459490070.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20330001131221 its reverse (12213110003302), we get a palindrome (32543111134523).

The spelling of 20330001131221 in words is "twenty trillion, three hundred thirty billion, one million, one hundred thirty-one thousand, two hundred twenty-one".