20311012213 has 4 divisors (see below), whose sum is σ = 20317527360. Its totient is φ = 20304497068.

The previous prime is 20311012207. The next prime is 20311012229. The reversal of 20311012213 is 31221011302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20311012213 - 2¹⁷ = 20310881141 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 (20311012283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3252895 + ... + 3259132.

It is an arithmetic number, because the mean of its divisors is an integer number (5079381840).

Almost surely, 2^20311012213 is an apocalyptic number.

It is an amenable number.

20311012213 is a deficient number, since it is larger than the sum of its proper divisors (6515147).

20311012213 is an equidigital number, since it uses as much as digits as its factorization.

20311012213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6515146.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20311012213 its reverse (31221011302), we get a palindrome (51532023515).

The spelling of 20311012213 in words is "twenty billion, three hundred eleven million, twelve thousand, two hundred thirteen".