31013245421 has 4 divisors (see below), whose sum is σ = 31013610012. Its totient is φ = 31012880832.

The previous prime is 31013245267. The next prime is 31013245477. The reversal of 31013245421 is 12454231013.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12454231013 = 7 ⋅1779175859.

It can be written as a sum of positive squares in 2 ways, for example, as 9378954025 + 21634291396 = 96845^2 + 147086^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013245421 - 2¹⁰ = 31013244397 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 (31013245721) 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, 20501 + ... + 249893.

It is an arithmetic number, because the mean of its divisors is an integer number (7753402503).

Almost surely, 2^31013245421 is an apocalyptic number.

It is an amenable number.

31013245421 is a deficient number, since it is larger than the sum of its proper divisors (364591).

31013245421 is a wasteful number, since it uses less digits than its factorization.

31013245421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364590.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 31013245421 its reverse (12454231013), we get a palindrome (43467476434).

It can be divided in two parts, 310132 and 45421, that added together give a palindrome (355553).

The spelling of 31013245421 in words is "thirty-one billion, thirteen million, two hundred forty-five thousand, four hundred twenty-one".