31314224221 has 4 divisors (see below), whose sum is σ = 35787684832. Its totient is φ = 26840763612.

The previous prime is 31314224209. The next prime is 31314224243. The reversal of 31314224221 is 12242241313.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12242241313 = 239 ⋅51222767.

It is a cyclic number.

It is not a de Polignac number, because 31314224221 - 2¹³ = 31314216029 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 (31314224261) 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, 2236730295 + ... + 2236730308.

It is an arithmetic number, because the mean of its divisors is an integer number (8946921208).

Almost surely, 2^31314224221 is an apocalyptic number.

It is an amenable number.

31314224221 is a deficient number, since it is larger than the sum of its proper divisors (4473460611).

31314224221 is an equidigital number, since it uses as much as digits as its factorization.

31314224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473460610.

The product of its digits is 2304, while the sum is 25.

Adding to 31314224221 its reverse (12242241313), we get a palindrome (43556465534).

The spelling of 31314224221 in words is "thirty-one billion, three hundred fourteen million, two hundred twenty-four thousand, two hundred twenty-one".