31421121 has 8 divisors (see below), whose sum is σ = 42485184. Its totient is φ = 20652240.

The previous prime is 31421111. The next prime is 31421141. The reversal of 31421121 is 12112413.

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

It is not a de Polignac number, because 31421121 - 2²² = 27226817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31421121.

It is not an unprimeable number, because it can be changed into a prime (31421101) 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, 73546 + ... + 73971.

It is an arithmetic number, because the mean of its divisors is an integer number (5310648).

Almost surely, 2^31421121 is an apocalyptic number.

It is an amenable number.

31421121 is a deficient number, since it is larger than the sum of its proper divisors (11064063).

31421121 is a wasteful number, since it uses less digits than its factorization.

31421121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147591.

The product of its digits is 48, while the sum is 15.

The square root of 31421121 is about 5605.4545756789. The cubic root of 31421121 is about 315.5541467725.

Adding to 31421121 its reverse (12112413), we get a palindrome (43533534).

The spelling of 31421121 in words is "thirty-one million, four hundred twenty-one thousand, one hundred twenty-one".