31521201140444 has 12 divisors (see below), whose sum is σ = 56335763740704. Its totient is φ = 15425268643104.

The previous prime is 31521201140383. The next prime is 31521201140581. The reversal of 31521201140444 is 44404110212513.

It is a super-2 number, since 2×31521201140444² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31521201140444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83832981569 + ... + 83832981944.

It is an arithmetic number, because the mean of its divisors is an integer number (4694646978392).

Almost surely, 2^{31521201140444} is an apocalyptic number.

It is an amenable number.

31521201140444 is a deficient number, since it is larger than the sum of its proper divisors (24814562600260).

31521201140444 is a wasteful number, since it uses less digits than its factorization.

31521201140444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167665963564 (or 167665963562 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

Adding to 31521201140444 its reverse (44404110212513), we get a palindrome (75925311352957).

The spelling of 31521201140444 in words is "thirty-one trillion, five hundred twenty-one billion, two hundred one million, one hundred forty thousand, four hundred forty-four".