31211013042 has 64 divisors (see below), whose sum is σ = 75696336000. Its totient is φ = 9453723840.

The previous prime is 31211013013. The next prime is 31211013049. The reversal of 31211013042 is 24031011213.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31211013049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1508584 + ... + 1529132.

It is an arithmetic number, because the mean of its divisors is an integer number (1182755250).

Almost surely, 2^31211013042 is an apocalyptic number.

31211013042 is an abundant number, since it is smaller than the sum of its proper divisors (44485322958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31211013042 is a wasteful number, since it uses less digits than its factorization.

31211013042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23128 (or 23122 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31211013042 its reverse (24031011213), we get a palindrome (55242024255).

The spelling of 31211013042 in words is "thirty-one billion, two hundred eleven million, thirteen thousand, forty-two".