31421243233 has 4 divisors (see below), whose sum is σ = 31468924080. Its totient is φ = 31373562388.

The previous prime is 31421243213. The next prime is 31421243239. The reversal of 31421243233 is 33234212413.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-31421243233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31421243239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23839435 + ... + 23840752.

It is an arithmetic number, because the mean of its divisors is an integer number (7867231020).

Almost surely, 2^31421243233 is an apocalyptic number.

It is an amenable number.

31421243233 is a deficient number, since it is larger than the sum of its proper divisors (47680847).

31421243233 is an equidigital number, since it uses as much as digits as its factorization.

31421243233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47680846.

The product of its digits is 10368, while the sum is 28.

Adding to 31421243233 its reverse (33234212413), we get a palindrome (64655455646).

The spelling of 31421243233 in words is "thirty-one billion, four hundred twenty-one million, two hundred forty-three thousand, two hundred thirty-three".