31330133021 has 8 divisors (see below), whose sum is σ = 34224963744. Its totient is φ = 28443075120.

The previous prime is 31330132961. The next prime is 31330133027. The reversal of 31330133021 is 12033103313.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31330133021 is a prime.

It is a super-2 number, since 2×31330133021² (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 = 31330132984 and 31330133002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330133027) 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, 1934771 + ... + 1950896.

It is an arithmetic number, because the mean of its divisors is an integer number (4278120468).

Almost surely, 2^31330133021 is an apocalyptic number.

It is an amenable number.

31330133021 is a deficient number, since it is larger than the sum of its proper divisors (2894830723).

31330133021 is a wasteful number, since it uses less digits than its factorization.

31330133021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3886411.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 31330133021 its reverse (12033103313), we get a palindrome (43363236334).

The spelling of 31330133021 in words is "thirty-one billion, three hundred thirty million, one hundred thirty-three thousand, twenty-one".