20213213331121 has 4 divisors (see below), whose sum is σ = 20213300963700. Its totient is φ = 20213125698544.

The previous prime is 20213213331097. The next prime is 20213213331131. The reversal of 20213213331121 is 12113331231202.

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 15603329511025 + 4609883820096 = 3950105^2 + 2147064^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213213331121 - 2²⁵ = 20213179776689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20213213331131) 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, 43469386 + ... + 43931923.

It is an arithmetic number, because the mean of its divisors is an integer number (5053325240925).

Almost surely, 2^{20213213331121} is an apocalyptic number.

It is an amenable number.

20213213331121 is a deficient number, since it is larger than the sum of its proper divisors (87632579).

20213213331121 is an equidigital number, since it uses as much as digits as its factorization.

20213213331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87632578.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 20213213331121 its reverse (12113331231202), we get a palindrome (32326544562323).

The spelling of 20213213331121 in words is "twenty trillion, two hundred thirteen billion, two hundred thirteen million, three hundred thirty-one thousand, one hundred twenty-one".