31040302421 has 4 divisors (see below), whose sum is σ = 31040654892. Its totient is φ = 31039949952.

The previous prime is 31040302411. The next prime is 31040302561. The reversal of 31040302421 is 12420304013.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14893517521 + 16146784900 = 122039^2 + 127070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31040302421 is a prime.

It is a super-2 number, since 2×31040302421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31040302393 and 31040302402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31040302411) 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, 81671 + ... + 262203.

It is an arithmetic number, because the mean of its divisors is an integer number (7760163723).

Almost surely, 2^31040302421 is an apocalyptic number.

It is an amenable number.

31040302421 is a deficient number, since it is larger than the sum of its proper divisors (352471).

31040302421 is a wasteful number, since it uses less digits than its factorization.

31040302421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352470.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31040302421 its reverse (12420304013), we get a palindrome (43460606434).

The spelling of 31040302421 in words is "thirty-one billion, forty million, three hundred two thousand, four hundred twenty-one".