31212103 has 6 divisors (see below), whose sum is σ = 33797904. Its totient is φ = 28811016.

The previous prime is 31212061. The next prime is 31212113. The reversal of 31212103 is 30121213.

It is not a de Polignac number, because 31212103 - 2²¹ = 29114951 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92175 + ... + 92512.

It is an arithmetic number, because the mean of its divisors is an integer number (5632984).

Almost surely, 2^31212103 is an apocalyptic number.

31212103 is a deficient number, since it is larger than the sum of its proper divisors (2585801).

31212103 is a wasteful number, since it uses less digits than its factorization.

31212103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184713 (or 184700 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31212103 is about 5586.7793047515. The cubic root of 31212103 is about 314.8528850280.

Adding to 31212103 its reverse (30121213), we get a palindrome (61333316).

It can be divided in two parts, 3121210 and 3, that added together give a palindrome (3121213).

The spelling of 31212103 in words is "thirty-one million, two hundred twelve thousand, one hundred three".