31234121011 has 4 divisors (see below), whose sum is σ = 31526028792. Its totient is φ = 30942213232.

The previous prime is 31234120999. The next prime is 31234121057. The reversal of 31234121011 is 11012143213.

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 31234121011 - 2⁹ = 31234120499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31234121011.

It is not an unprimeable number, because it can be changed into a prime (31234121081) 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, 145953730 + ... + 145953943.

It is an arithmetic number, because the mean of its divisors is an integer number (7881507198).

Almost surely, 2^31234121011 is an apocalyptic number.

31234121011 is a deficient number, since it is larger than the sum of its proper divisors (291907781).

31234121011 is a wasteful number, since it uses less digits than its factorization.

31234121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291907780.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31234121011 its reverse (11012143213), we get a palindrome (42246264224).

The spelling of 31234121011 in words is "thirty-one billion, two hundred thirty-four million, one hundred twenty-one thousand, eleven".