31224121 has 8 divisors (see below), whose sum is σ = 33765120. Its totient is φ = 28761408.

The previous prime is 31224113. The next prime is 31224199. The reversal of 31224121 is 12142213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31224121 - 2³ = 31224113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31224095 and 31224104.

It is not an unprimeable number, because it can be changed into a prime (31224521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18741 + ... + 20338.

It is an arithmetic number, because the mean of its divisors is an integer number (4220640).

Almost surely, 2^31224121 is an apocalyptic number.

It is an amenable number.

31224121 is a deficient number, since it is larger than the sum of its proper divisors (2540999).

31224121 is a wasteful number, since it uses less digits than its factorization.

31224121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39143.

The product of its digits is 96, while the sum is 16.

The square root of 31224121 is about 5587.8547762088. The cubic root of 31224121 is about 314.8932904697.

Adding to 31224121 its reverse (12142213), we get a palindrome (43366334).

The spelling of 31224121 in words is "thirty-one million, two hundred twenty-four thousand, one hundred twenty-one".