31321121 has 16 divisors (see below), whose sum is σ = 34664448. Its totient is φ = 28123200.

The previous prime is 31321109. The next prime is 31321127. The reversal of 31321121 is 12112313.

It is a cyclic number.

It is not a de Polignac number, because 31321121 - 2⁶ = 31321057 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31321096 and 31321105.

It is not an unprimeable number, because it can be changed into a prime (31321127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100556 + ... + 100866.

It is an arithmetic number, because the mean of its divisors is an integer number (2166528).

Almost surely, 2^31321121 is an apocalyptic number.

It is an amenable number.

31321121 is a deficient number, since it is larger than the sum of its proper divisors (3343327).

31321121 is a wasteful number, since it uses less digits than its factorization.

31321121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512.

The product of its digits is 36, while the sum is 14.

The square root of 31321121 is about 5596.5275841364. The cubic root of 31321121 is about 315.2190330148.

Adding to 31321121 its reverse (12112313), we get a palindrome (43433434).

The spelling of 31321121 in words is "thirty-one million, three hundred twenty-one thousand, one hundred twenty-one".