31101140321 has 4 divisors (see below), whose sum is σ = 32104402944. Its totient is φ = 30097877700.

The previous prime is 31101140303. The next prime is 31101140333. The reversal of 31101140321 is 12304110113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12304110113 = 53 ⋅232153021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31101140321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31101140321.

It is not an unprimeable number, because it can be changed into a prime (31101140621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501631265 + ... + 501631326.

It is an arithmetic number, because the mean of its divisors is an integer number (8026100736).

Almost surely, 2^31101140321 is an apocalyptic number.

31101140321 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31101140321 is a deficient number, since it is larger than the sum of its proper divisors (1003262623).

31101140321 is a wasteful number, since it uses less digits than its factorization.

31101140321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003262622.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31101140321 its reverse (12304110113), we get a palindrome (43405250434).

The spelling of 31101140321 in words is "thirty-one billion, one hundred one million, one hundred forty thousand, three hundred twenty-one".