31303133221 has 8 divisors (see below), whose sum is σ = 32349534464. Its totient is φ = 30259020960.

The previous prime is 31303133219. The next prime is 31303133231. The reversal of 31303133221 is 12233130313.

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 31303133221 - 2¹ = 31303133219 is a prime.

It is a super-2 number, since 2×31303133221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31303133192 and 31303133201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31303133231) 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 7 ways as a sum of consecutive naturals, for example, 544416 + ... + 599161.

It is an arithmetic number, because the mean of its divisors is an integer number (4043691808).

Almost surely, 2^31303133221 is an apocalyptic number.

31303133221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31303133221 is a deficient number, since it is larger than the sum of its proper divisors (1046401243).

31303133221 is a wasteful number, since it uses less digits than its factorization.

31303133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144491.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31303133221 its reverse (12233130313), we get a palindrome (43536263534).

The spelling of 31303133221 in words is "thirty-one billion, three hundred three million, one hundred thirty-three thousand, two hundred twenty-one".