31030434221 has 4 divisors (see below), whose sum is σ = 31030851744. Its totient is φ = 31030016700.

The previous prime is 31030434209. The next prime is 31030434251. The reversal of 31030434221 is 12243403013.

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: 12243403013 = 2609 ⋅4692757.

It is a cyclic number.

It is not a de Polignac number, because 31030434221 - 2¹⁰ = 31030433197 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 (31030434251) 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, 63665 + ... + 257126.

It is an arithmetic number, because the mean of its divisors is an integer number (7757712936).

Almost surely, 2^31030434221 is an apocalyptic number.

It is an amenable number.

31030434221 is a deficient number, since it is larger than the sum of its proper divisors (417523).

31030434221 is an equidigital number, since it uses as much as digits as its factorization.

31030434221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417522.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31030434221 its reverse (12243403013), we get a palindrome (43273837234).

The spelling of 31030434221 in words is "thirty-one billion, thirty million, four hundred thirty-four thousand, two hundred twenty-one".