31212034221 has 16 divisors (see below), whose sum is σ = 44071763904. Its totient is φ = 19580592384.

The previous prime is 31212034177. The next prime is 31212034229. The reversal of 31212034221 is 12243021213.

It is not a de Polignac number, because 31212034221 - 2²⁵ = 31178479789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212034229) 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 15 ways as a sum of consecutive naturals, for example, 258150 + ... + 359256.

It is an arithmetic number, because the mean of its divisors is an integer number (2754485244).

Almost surely, 2^31212034221 is an apocalyptic number.

It is an amenable number.

31212034221 is a deficient number, since it is larger than the sum of its proper divisors (12859729683).

31212034221 is a wasteful number, since it uses less digits than its factorization.

31212034221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107180.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31212034221 its reverse (12243021213), we get a palindrome (43455055434).

The spelling of 31212034221 in words is "thirty-one billion, two hundred twelve million, thirty-four thousand, two hundred twenty-one".