31244042221 has 8 divisors (see below), whose sum is σ = 35788818560. Its totient is φ = 26719601328.

The previous prime is 31244042213. The next prime is 31244042231. The reversal of 31244042221 is 12224044213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31244042221 - 2³ = 31244042213 is a prime.

It is a super-2 number, since 2×31244042221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31244042231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5080566 + ... + 5086711.

It is an arithmetic number, because the mean of its divisors is an integer number (4473602320).

Almost surely, 2^31244042221 is an apocalyptic number.

It is an amenable number.

31244042221 is a deficient number, since it is larger than the sum of its proper divisors (4544776339).

31244042221 is a wasteful number, since it uses less digits than its factorization.

31244042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10167723.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 31244042221 its reverse (12224044213), we get a palindrome (43468086434).

The spelling of 31244042221 in words is "thirty-one billion, two hundred forty-four million, forty-two thousand, two hundred twenty-one".