31302312031021 has 8 divisors (see below), whose sum is σ = 33169100026104. Its totient is φ = 29438354649600.

The previous prime is 31302312030989. The next prime is 31302312031051. The reversal of 31302312031021 is 12013021320313.

It can be written as a sum of positive squares in 4 ways, for example, as 5203097860900 + 26099214170121 = 2281030^2 + 5108739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31302312031021 - 2⁵ = 31302312030989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31302312030983 and 31302312031001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31302312031051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707630640 + ... + 707674873.

It is an arithmetic number, because the mean of its divisors is an integer number (4146137503263).

Almost surely, 2^{31302312031021} is an apocalyptic number.

It is an amenable number.

31302312031021 is a deficient number, since it is larger than the sum of its proper divisors (1866787995083).

31302312031021 is a wasteful number, since it uses less digits than its factorization.

31302312031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415306831.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31302312031021 its reverse (12013021320313), we get a palindrome (43315333351334).

The spelling of 31302312031021 in words is "thirty-one trillion, three hundred two billion, three hundred twelve million, thirty-one thousand, twenty-one".