31043521464021 has 64 divisors (see below), whose sum is σ = 50847548006400. Its totient is φ = 18561065889600.

The previous prime is 31043521464019. The next prime is 31043521464037. The reversal of 31043521464021 is 12046412534013.

31043521464021 is a `hidden beast` number, since 3 + 1 + 0 + 4 + 3 + 5 + 2 + 1 + 4 + 640 + 2 + 1 = 666.

It is not a de Polignac number, because 31043521464021 - 2¹ = 31043521464019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31043521464721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28488936 + ... + 29558526.

It is an arithmetic number, because the mean of its divisors is an integer number (794492937600).

Almost surely, 2^{31043521464021} is an apocalyptic number.

It is an amenable number.

31043521464021 is a deficient number, since it is larger than the sum of its proper divisors (19804026542379).

31043521464021 is a wasteful number, since it uses less digits than its factorization.

31043521464021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070927 (or 1070921 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 31043521464021 its reverse (12046412534013), we get a palindrome (43089933998034).

The spelling of 31043521464021 in words is "thirty-one trillion, forty-three billion, five hundred twenty-one million, four hundred sixty-four thousand, twenty-one".