31322121 has 16 divisors (see below), whose sum is σ = 43438080. Its totient is φ = 20054160.

The previous prime is 31322119. The next prime is 31322129. The reversal of 31322121 is 12122313.

31322121 = 404² + 405² + ... + 542².

It is not a de Polignac number, because 31322121 - 2¹ = 31322119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31322121.

It is not an unprimeable number, because it can be changed into a prime (31322129) 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 15 ways as a sum of consecutive naturals, for example, 11716 + ... + 14138.

It is an arithmetic number, because the mean of its divisors is an integer number (2714880).

Almost surely, 2^31322121 is an apocalyptic number.

31322121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31322121 is a deficient number, since it is larger than the sum of its proper divisors (12115959).

31322121 is a wasteful number, since it uses less digits than its factorization.

31322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596.

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

The square root of 31322121 is about 5596.6169245358. The cubic root of 31322121 is about 315.2223876806. Note that the first 3 decimals are identical.

Adding to 31322121 its reverse (12122313), we get a palindrome (43444434).

It can be divided in two parts, 3132 and 2121, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 31322121 in words is "thirty-one million, three hundred twenty-two thousand, one hundred twenty-one".