31212021044 has 6 divisors (see below), whose sum is σ = 54621036834. Its totient is φ = 15606010520.

The previous prime is 31212021013. The next prime is 31212021079. The reversal of 31212021044 is 44012021213.

It can be written as a sum of positive squares in only one way, i.e., 30185587600 + 1026433444 = 173740^2 + 32038^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3901502627 + ... + 3901502634.

It is an arithmetic number, because the mean of its divisors is an integer number (9103506139).

Almost surely, 2^31212021044 is an apocalyptic number.

It is an amenable number.

31212021044 is a deficient number, since it is larger than the sum of its proper divisors (23409015790).

31212021044 is a wasteful number, since it uses less digits than its factorization.

31212021044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7803005265 (or 7803005263 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31212021044 its reverse (44012021213), we get a palindrome (75224042257).

The spelling of 31212021044 in words is "thirty-one billion, two hundred twelve million, twenty-one thousand, forty-four".