31424224121 has 4 divisors (see below), whose sum is σ = 31424589732. Its totient is φ = 31423858512.

The previous prime is 31424224067. The next prime is 31424224129. The reversal of 31424224121 is 12142242413.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12142242413 = 7 ⋅1734606059.

It can be written as a sum of positive squares in 2 ways, for example, as 12563047225 + 18861176896 = 112085^2 + 137336^2 .

It is a cyclic number.

It is not a de Polignac number, because 31424224121 - 2¹⁰ = 31424223097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31424224129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24431 + ... + 251883.

It is an arithmetic number, because the mean of its divisors is an integer number (7856147433).

Almost surely, 2^31424224121 is an apocalyptic number.

It is an amenable number.

31424224121 is a deficient number, since it is larger than the sum of its proper divisors (365611).

31424224121 is a wasteful number, since it uses less digits than its factorization.

31424224121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365610.

The product of its digits is 3072, while the sum is 26.

Adding to 31424224121 its reverse (12142242413), we get a palindrome (43566466534).

The spelling of 31424224121 in words is "thirty-one billion, four hundred twenty-four million, two hundred twenty-four thousand, one hundred twenty-one".