31421021330221 has 4 divisors (see below), whose sum is σ = 31421035767744. Its totient is φ = 31421006892700.

The previous prime is 31421021330219. The next prime is 31421021330227. The reversal of 31421021330221 is 12203312012413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31421021330221 - 2¹ = 31421021330219 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 (31421021330227) 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, 3213475 + ... + 8553856.

It is an arithmetic number, because the mean of its divisors is an integer number (7855258941936).

Almost surely, 2^{31421021330221} is an apocalyptic number.

It is an amenable number.

31421021330221 is a deficient number, since it is larger than the sum of its proper divisors (14437523).

31421021330221 is a wasteful number, since it uses less digits than its factorization.

31421021330221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14437522.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 31421021330221 its reverse (12203312012413), we get a palindrome (43624333342634).

The spelling of 31421021330221 in words is "thirty-one trillion, four hundred twenty-one billion, twenty-one million, three hundred thirty thousand, two hundred twenty-one".