31123322421 has 4 divisors (see below), whose sum is σ = 41497763232. Its totient is φ = 20748881612.

The previous prime is 31123322393. The next prime is 31123322429. The reversal of 31123322421 is 12422332113.

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.

It is a cyclic number.

It is not a de Polignac number, because 31123322421 - 2⁵ = 31123322389 is a prime.

It is a super-2 number, since 2×31123322421² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31123322391 and 31123322400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123322429) 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, 5187220401 + ... + 5187220406.

It is an arithmetic number, because the mean of its divisors is an integer number (10374440808).

Almost surely, 2^31123322421 is an apocalyptic number.

It is an amenable number.

31123322421 is a deficient number, since it is larger than the sum of its proper divisors (10374440811).

31123322421 is a wasteful number, since it uses less digits than its factorization.

31123322421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10374440810.

The product of its digits is 1728, while the sum is 24.

Adding to 31123322421 its reverse (12422332113), we get a palindrome (43545654534).

The spelling of 31123322421 in words is "thirty-one billion, one hundred twenty-three million, three hundred twenty-two thousand, four hundred twenty-one".