31121201011 has 8 divisors (see below), whose sum is σ = 33652964160. Its totient is φ = 28667338368.

The previous prime is 31121200991. The next prime is 31121201021. The reversal of 31121201011 is 11010212113.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31121201011 - 2¹³ = 31121192819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31121200982 and 31121201000.

It is not an unprimeable number, because it can be changed into a prime (31121201021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19474296 + ... + 19475893.

It is an arithmetic number, because the mean of its divisors is an integer number (4206620520).

Almost surely, 2^31121201011 is an apocalyptic number.

31121201011 is a deficient number, since it is larger than the sum of its proper divisors (2531763149).

31121201011 is a wasteful number, since it uses less digits than its factorization.

31121201011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38950253.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 31121201011 its reverse (11010212113), we get a palindrome (42131413124).

The spelling of 31121201011 in words is "thirty-one billion, one hundred twenty-one million, two hundred one thousand, eleven".