31133103221 has 16 divisors (see below), whose sum is σ = 36838343808. Its totient is φ = 25988236800.

The previous prime is 31133103217. The next prime is 31133103227. The reversal of 31133103221 is 12230133113.

It is a cyclic number.

It is not a de Polignac number, because 31133103221 - 2² = 31133103217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31133103193 and 31133103202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31133103227) 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 15 ways as a sum of consecutive naturals, for example, 2022665 + ... + 2037998.

It is an arithmetic number, because the mean of its divisors is an integer number (2302396488).

Almost surely, 2^31133103221 is an apocalyptic number.

It is an amenable number.

31133103221 is a deficient number, since it is larger than the sum of its proper divisors (5705240587).

31133103221 is a wasteful number, since it uses less digits than its factorization.

31133103221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060732.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31133103221 its reverse (12230133113), we get a palindrome (43363236334).

The spelling of 31133103221 in words is "thirty-one billion, one hundred thirty-three million, one hundred three thousand, two hundred twenty-one".