31243300421 has 4 divisors (see below), whose sum is σ = 31249190700. Its totient is φ = 31237410144.

The previous prime is 31243300321. The next prime is 31243300447. The reversal of 31243300421 is 12400334213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2392579396 + 28850721025 = 48914^2 + 169855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31243300421 is a prime.

It is a super-2 number, since 2×31243300421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31243300021) 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, 2937176 + ... + 2947793.

It is an arithmetic number, because the mean of its divisors is an integer number (7812297675).

Almost surely, 2^31243300421 is an apocalyptic number.

It is an amenable number.

31243300421 is a deficient number, since it is larger than the sum of its proper divisors (5890279).

31243300421 is an equidigital number, since it uses as much as digits as its factorization.

31243300421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5890278.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31243300421 its reverse (12400334213), we get a palindrome (43643634634).

The spelling of 31243300421 in words is "thirty-one billion, two hundred forty-three million, three hundred thousand, four hundred twenty-one".