31721264043 has 16 divisors (see below), whose sum is σ = 48489657600. Its totient is φ = 18069251616.

The previous prime is 31721264027. The next prime is 31721264059. The reversal of 31721264043 is 34046212713.

It is an interprime number because it is at equal distance from previous prime (31721264027) and next prime (31721264059).

It is not a de Polignac number, because 31721264043 - 2⁴ = 31721264027 is a prime.

It is a super-3 number, since 3×31721264043³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31721263995 and 31721264013.

It is not an unprimeable number, because it can be changed into a prime (31721264243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2375893 + ... + 2389206.

It is an arithmetic number, because the mean of its divisors is an integer number (3030603600).

Almost surely, 2^31721264043 is an apocalyptic number.

31721264043 is a deficient number, since it is larger than the sum of its proper divisors (16768393557).

31721264043 is a wasteful number, since it uses less digits than its factorization.

31721264043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4765426.

The product of its (nonzero) digits is 24192, while the sum is 33.

Adding to 31721264043 its reverse (34046212713), we get a palindrome (65767476756).

The spelling of 31721264043 in words is "thirty-one billion, seven hundred twenty-one million, two hundred sixty-four thousand, forty-three".