31234100221 has 16 divisors (see below), whose sum is σ = 33471204480. Its totient is φ = 29043463680.

The previous prime is 31234100197. The next prime is 31234100297. The reversal of 31234100221 is 12200143213.

It is a happy number.

It is not a de Polignac number, because 31234100221 - 2¹⁷ = 31233969149 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 (31234100021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459640 + ... + 523198.

It is an arithmetic number, because the mean of its divisors is an integer number (2091950280).

Almost surely, 2^31234100221 is an apocalyptic number.

It is an amenable number.

31234100221 is a deficient number, since it is larger than the sum of its proper divisors (2237104259).

31234100221 is a wasteful number, since it uses less digits than its factorization.

31234100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63924.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31234100221 its reverse (12200143213), we get a palindrome (43434243434).

The spelling of 31234100221 in words is "thirty-one billion, two hundred thirty-four million, one hundred thousand, two hundred twenty-one".