31103421 has 32 divisors (see below), whose sum is σ = 46096128. Its totient is φ = 18570240.

The previous prime is 31103419. The next prime is 31103441. The reversal of 31103421 is 12430113.

It is not a de Polignac number, because 31103421 - 2¹ = 31103419 is a prime.

31103421 is a modest number, since divided by 3421 gives 3110 as remainder.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31103421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99856 + ... + 100166.

It is an arithmetic number, because the mean of its divisors is an integer number (1440504).

Almost surely, 2^31103421 is an apocalyptic number.

It is an amenable number.

31103421 is a deficient number, since it is larger than the sum of its proper divisors (14992707).

31103421 is a wasteful number, since it uses less digits than its factorization.

31103421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 31103421 is about 5577.0441095620. The cubic root of 31103421 is about 314.4870158922.

Adding to 31103421 its reverse (12430113), we get a palindrome (43533534).

The spelling of 31103421 in words is "thirty-one million, one hundred three thousand, four hundred twenty-one".