31241122421 has 4 divisors (see below), whose sum is σ = 31269864192. Its totient is φ = 31212380652.

The previous prime is 31241122417. The next prime is 31241122427. The reversal of 31241122421 is 12422114213.

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: 12422114213 = 89 ⋅139574317.

It is a cyclic number.

It is not a de Polignac number, because 31241122421 - 2² = 31241122417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31241122427) 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, 14369255 + ... + 14371428.

It is an arithmetic number, because the mean of its divisors is an integer number (7817466048).

Almost surely, 2^31241122421 is an apocalyptic number.

It is an amenable number.

31241122421 is a deficient number, since it is larger than the sum of its proper divisors (28741771).

31241122421 is a wasteful number, since it uses less digits than its factorization.

31241122421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28741770.

The product of its digits is 768, while the sum is 23.

Adding to 31241122421 its reverse (12422114213), we get a palindrome (43663236634).

The spelling of 31241122421 in words is "thirty-one billion, two hundred forty-one million, one hundred twenty-two thousand, four hundred twenty-one".