20313123211 has 4 divisors (see below), whose sum is σ = 20502965592. Its totient is φ = 20123280832.

The previous prime is 20313123191. The next prime is 20313123239. The reversal of 20313123211 is 11232131302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20313123211 - 2¹⁵ = 20313090443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20313123011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94921030 + ... + 94921243.

It is an arithmetic number, because the mean of its divisors is an integer number (5125741398).

Almost surely, 2^20313123211 is an apocalyptic number.

20313123211 is a deficient number, since it is larger than the sum of its proper divisors (189842381).

20313123211 is a wasteful number, since it uses less digits than its factorization.

20313123211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189842380.

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

Adding to 20313123211 its reverse (11232131302), we get a palindrome (31545254513).

The spelling of 20313123211 in words is "twenty billion, three hundred thirteen million, one hundred twenty-three thousand, two hundred eleven".