31424313421 has 4 divisors (see below), whose sum is σ = 31541132700. Its totient is φ = 31307494144.

The previous prime is 31424313367. The next prime is 31424313433. The reversal of 31424313421 is 12431342413.

It is a happy number.

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 8950106025 + 22474207396 = 94605^2 + 149914^2 .

It is a cyclic number.

It is not a de Polignac number, because 31424313421 - 2³¹ = 29276829773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31424313421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31424313451) 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, 58409236 + ... + 58409773.

It is an arithmetic number, because the mean of its divisors is an integer number (7885283175).

Almost surely, 2^31424313421 is an apocalyptic number.

It is an amenable number.

31424313421 is a deficient number, since it is larger than the sum of its proper divisors (116819279).

31424313421 is a wasteful number, since it uses less digits than its factorization.

31424313421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116819278.

The product of its digits is 6912, while the sum is 28.

Adding to 31424313421 its reverse (12431342413), we get a palindrome (43855655834).

The spelling of 31424313421 in words is "thirty-one billion, four hundred twenty-four million, three hundred thirteen thousand, four hundred twenty-one".