31422121 has 4 divisors (see below), whose sum is σ = 32152912. Its totient is φ = 30691332.

The previous prime is 31422101. The next prime is 31422151. The reversal of 31422121 is 12122413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12122413 = 1499 ⋅8087.

It is a cyclic number.

It is not a de Polignac number, because 31422121 - 2⁵ = 31422089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31422095 and 31422104.

It is not an unprimeable number, because it can be changed into a prime (31422101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365331 + ... + 365416.

It is an arithmetic number, because the mean of its divisors is an integer number (8038228).

Almost surely, 2^31422121 is an apocalyptic number.

It is an amenable number.

31422121 is a deficient number, since it is larger than the sum of its proper divisors (730791).

31422121 is an equidigital number, since it uses as much as digits as its factorization.

31422121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730790.

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

The square root of 31422121 is about 5605.5437738011. The cubic root of 31422121 is about 315.5574943170.

Adding to 31422121 its reverse (12122413), we get a palindrome (43544534).

The spelling of 31422121 in words is "thirty-one million, four hundred twenty-two thousand, one hundred twenty-one".