20213331132221 has 4 divisors (see below), whose sum is σ = 20233605286812. Its totient is φ = 20193056977632.

The previous prime is 20213331132217. The next prime is 20213331132223. The reversal of 20213331132221 is 12223113331202.

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 15062269668196 + 5151061464025 = 3881014^2 + 2269595^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213331132221 - 2² = 20213331132217 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 (20213331132223) 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, 10137075800 + ... + 10137077793.

It is an arithmetic number, because the mean of its divisors is an integer number (5058401321703).

Almost surely, 2^{20213331132221} is an apocalyptic number.

It is an amenable number.

20213331132221 is a deficient number, since it is larger than the sum of its proper divisors (20274154591).

20213331132221 is an equidigital number, since it uses as much as digits as its factorization.

20213331132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20274154590.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 20213331132221 its reverse (12223113331202), we get a palindrome (32436444463423).

The spelling of 20213331132221 in words is "twenty trillion, two hundred thirteen billion, three hundred thirty-one million, one hundred thirty-two thousand, two hundred twenty-one".