31240231000221 has 16 divisors (see below), whose sum is σ = 42256343663424. Its totient is φ = 20527445576064.

The previous prime is 31240231000189. The next prime is 31240231000267. The reversal of 31240231000221 is 12200013204213.

It is not a de Polignac number, because 31240231000221 - 2⁵ = 31240231000189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240231700221) 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, 246945880 + ... + 247072353.

It is an arithmetic number, because the mean of its divisors is an integer number (2641021478964).

Almost surely, 2^{31240231000221} is an apocalyptic number.

It is an amenable number.

31240231000221 is a deficient number, since it is larger than the sum of its proper divisors (11016112663203).

31240231000221 is a wasteful number, since it uses less digits than its factorization.

31240231000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494018540.

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

Adding to 31240231000221 its reverse (12200013204213), we get a palindrome (43440244204434).

The spelling of 31240231000221 in words is "thirty-one trillion, two hundred forty billion, two hundred thirty-one million, two hundred twenty-one", and thus it is an aban number.