31211020013011 has 4 divisors (see below), whose sum is σ = 31287330575800. Its totient is φ = 31134709450224.

The previous prime is 31211020012943. The next prime is 31211020013113. The reversal of 31211020013011 is 11031002011213.

It is a happy number.

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 31211020013011 - 2¹³ = 31211020004819 is a prime.

It is a super-2 number, since 2×31211020013011² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31211020013711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38155280781 + ... + 38155281598.

It is an arithmetic number, because the mean of its divisors is an integer number (7821832643950).

Almost surely, 2^{31211020013011} is an apocalyptic number.

31211020013011 is a deficient number, since it is larger than the sum of its proper divisors (76310562789).

31211020013011 is an equidigital number, since it uses as much as digits as its factorization.

31211020013011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76310562788.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 31211020013011 its reverse (11031002011213), we get a palindrome (42242022024224).

The spelling of 31211020013011 in words is "thirty-one trillion, two hundred eleven billion, twenty million, thirteen thousand, eleven".