31104021 has 8 divisors (see below), whose sum is σ = 44662240. Its totient is φ = 19140912.

The previous prime is 31103993. The next prime is 31104049. The reversal of 31104021 is 12040113.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31103993) and next prime (31104049).

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

It is not a de Polignac number, because 31104021 - 2⁶ = 31103957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31103988 and 31104006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398731 + ... + 398808.

It is an arithmetic number, because the mean of its divisors is an integer number (5582780).

Almost surely, 2^31104021 is an apocalyptic number.

It is an amenable number.

31104021 is a deficient number, since it is larger than the sum of its proper divisors (13558219).

31104021 is a wasteful number, since it uses less digits than its factorization.

31104021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797555.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 31104021 is about 5577.0979012386. The cubic root of 31104021 is about 314.4890380812.

Adding to 31104021 its reverse (12040113), we get a palindrome (43144134).

The spelling of 31104021 in words is "thirty-one million, one hundred four thousand, twenty-one".