31123312221321 has 24 divisors (see below), whose sum is σ = 46555301445120. Its totient is φ = 20014991726400.

The previous prime is 31123312221283. The next prime is 31123312221347. The reversal of 31123312221321 is 12312221332113.

31123312221321 is a `hidden beast` number, since 3 + 1 + 1 + 2 + 3 + 312 + 2 + 21 + 321 = 666.

It is not a de Polignac number, because 31123312221321 - 2⁶ = 31123312221257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31123312220321) 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 23 ways as a sum of consecutive naturals, for example, 179259036 + ... + 179432573.

It is an arithmetic number, because the mean of its divisors is an integer number (1939804226880).

Almost surely, 2^{31123312221321} is an apocalyptic number.

31123312221321 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31123312221321 is a deficient number, since it is larger than the sum of its proper divisors (15431989223799).

31123312221321 is a wasteful number, since it uses less digits than its factorization.

31123312221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358691957 (or 358691954 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 31123312221321 its reverse (12312221332113), we get a palindrome (43435533553434).

The spelling of 31123312221321 in words is "thirty-one trillion, one hundred twenty-three billion, three hundred twelve million, two hundred twenty-one thousand, three hundred twenty-one".