31201243221 has 8 divisors (see below), whose sum is σ = 41710279680. Its totient is φ = 20746517792.

The previous prime is 31201243217. The next prime is 31201243273. The reversal of 31201243221 is 12234210213.

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

It is a cyclic number.

It is not a de Polignac number, because 31201243221 - 2² = 31201243217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201243291) 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, 13576416 + ... + 13578713.

It is an arithmetic number, because the mean of its divisors is an integer number (5213784960).

Almost surely, 2^31201243221 is an apocalyptic number.

It is an amenable number.

31201243221 is a deficient number, since it is larger than the sum of its proper divisors (10509036459).

31201243221 is a wasteful number, since it uses less digits than its factorization.

31201243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27155515.

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

Adding to 31201243221 its reverse (12234210213), we get a palindrome (43435453434).

The spelling of 31201243221 in words is "thirty-one billion, two hundred one million, two hundred forty-three thousand, two hundred twenty-one".