31213012044 has 48 divisors (see below), whose sum is σ = 77154311808. Its totient is φ = 9787262208.

The previous prime is 31213012021. The next prime is 31213012049. The reversal of 31213012044 is 44021031213.

It is a self number, because there is not a number n which added to its sum of digits gives 31213012044.

It is not an unprimeable number, because it can be changed into a prime (31213012049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366847 + ... + 443849.

It is an arithmetic number, because the mean of its divisors is an integer number (1607381496).

Almost surely, 2^31213012044 is an apocalyptic number.

31213012044 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

31213012044 is an abundant number, since it is smaller than the sum of its proper divisors (45941299764).

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

31213012044 is a wasteful number, since it uses less digits than its factorization.

31213012044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79014 (or 79012 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31213012044 its reverse (44021031213), we get a palindrome (75234043257).

The spelling of 31213012044 in words is "thirty-one billion, two hundred thirteen million, twelve thousand, forty-four".