31204304502421 has 4 divisors (see below), whose sum is σ = 31204339303852. Its totient is φ = 31204269700992.

The previous prime is 31204304502403. The next prime is 31204304502431. The reversal of 31204304502421 is 12420540340213.

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 16613050479921 + 14591254022500 = 4075911^2 + 3819850^2 .

It is a cyclic number.

It is not a de Polignac number, because 31204304502421 - 2¹⁷ = 31204304371349 is a prime.

It is a super-2 number, since 2×31204304502421² (a number of 28 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 (31204304502401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16019196 + ... + 17861221.

It is an arithmetic number, because the mean of its divisors is an integer number (7801084825963).

Almost surely, 2^{31204304502421} is an apocalyptic number.

It is an amenable number.

31204304502421 is a deficient number, since it is larger than the sum of its proper divisors (34801431).

31204304502421 is an equidigital number, since it uses as much as digits as its factorization.

31204304502421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34801430.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 31204304502421 its reverse (12420540340213), we get a palindrome (43624844842634).

The spelling of 31204304502421 in words is "thirty-one trillion, two hundred four billion, three hundred four million, five hundred two thousand, four hundred twenty-one".