20320131221213 has 16 divisors (see below), whose sum is σ = 20806891275456. Its totient is φ = 19834021428480.

The previous prime is 20320131221209. The next prime is 20320131221227. The reversal of 20320131221213 is 31212213102302.

It is a cyclic number.

It is not a de Polignac number, because 20320131221213 - 2² = 20320131221209 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 (20320131229213) 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, 392353106 + ... + 392404892.

It is an arithmetic number, because the mean of its divisors is an integer number (1300430704716).

Almost surely, 2^{20320131221213} is an apocalyptic number.

It is an amenable number.

20320131221213 is a deficient number, since it is larger than the sum of its proper divisors (486760054243).

20320131221213 is a wasteful number, since it uses less digits than its factorization.

20320131221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57884.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 20320131221213 its reverse (31212213102302), we get a palindrome (51532344323515).

The spelling of 20320131221213 in words is "twenty trillion, three hundred twenty billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred thirteen".