31234120221 has 16 divisors (see below), whose sum is σ = 43460444160. Its totient is φ = 19915449840.

The previous prime is 31234120217. The next prime is 31234120243. The reversal of 31234120221 is 12202143213.

It is not a de Polignac number, because 31234120221 - 2² = 31234120217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31234120201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1067416 + ... + 1096286.

It is an arithmetic number, because the mean of its divisors is an integer number (2716277760).

Almost surely, 2^31234120221 is an apocalyptic number.

It is an amenable number.

31234120221 is a deficient number, since it is larger than the sum of its proper divisors (12226323939).

31234120221 is a wasteful number, since it uses less digits than its factorization.

31234120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44576.

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

Adding to 31234120221 its reverse (12202143213), we get a palindrome (43436263434).

The spelling of 31234120221 in words is "thirty-one billion, two hundred thirty-four million, one hundred twenty thousand, two hundred twenty-one".