31021104 has 20 divisors (see below), whose sum is σ = 80137976. Its totient is φ = 10340352.

The previous prime is 31021093. The next prime is 31021127. The reversal of 31021104 is 40112013.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 31021104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323089 + ... + 323184.

Almost surely, 2^31021104 is an apocalyptic number.

It is an amenable number.

31021104 is an abundant number, since it is smaller than the sum of its proper divisors (49116872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31021104 is a wasteful number, since it uses less digits than its factorization.

31021104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646284 (or 646278 counting only the distinct ones).

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

The square root of 31021104 is about 5569.6592355368. The cubic root of 31021104 is about 314.2093347648.

Adding to 31021104 its reverse (40112013), we get a palindrome (71133117).

Subtracting 31021104 from its reverse (40112013), we obtain a palindrome (9090909).

It can be divided in two parts, 31021 and 104, that added together give a triangular number (31125 = T₂₄₉).

The spelling of 31021104 in words is "thirty-one million, twenty-one thousand, one hundred four".