31240200421 has 4 divisors (see below), whose sum is σ = 31241196652. Its totient is φ = 31239204192.

The previous prime is 31240200419. The next prime is 31240200479. The reversal of 31240200421 is 12400204213.

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 13112540100 + 18127660321 = 114510^2 + 134639^2 .

It is a cyclic number.

It is not a de Polignac number, because 31240200421 - 2¹ = 31240200419 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 (31240200401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449496 + ... + 514321.

It is an arithmetic number, because the mean of its divisors is an integer number (7810299163).

Almost surely, 2^31240200421 is an apocalyptic number.

It is an amenable number.

31240200421 is a deficient number, since it is larger than the sum of its proper divisors (996231).

31240200421 is an equidigital number, since it uses as much as digits as its factorization.

31240200421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996230.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 31240200421 its reverse (12400204213), we get a palindrome (43640404634).

The spelling of 31240200421 in words is "thirty-one billion, two hundred forty million, two hundred thousand, four hundred twenty-one".