20133231311 has 4 divisors (see below), whose sum is σ = 20133605592. Its totient is φ = 20132857032.

The previous prime is 20133231301. The next prime is 20133231337. The reversal of 20133231311 is 11313233102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11313233102 = 2 ⋅5656616551.

It is a cyclic number.

It is not a de Polignac number, because 20133231311 - 2²² = 20129037007 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 (20133231301) 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, 89456 + ... + 219701.

It is an arithmetic number, because the mean of its divisors is an integer number (5033401398).

Almost surely, 2^20133231311 is an apocalyptic number.

20133231311 is a deficient number, since it is larger than the sum of its proper divisors (374281).

20133231311 is an equidigital number, since it uses as much as digits as its factorization.

20133231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374280.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20133231311 its reverse (11313233102), we get a palindrome (31446464413).

The spelling of 20133231311 in words is "twenty billion, one hundred thirty-three million, two hundred thirty-one thousand, three hundred eleven".