31330221013 has 32 divisors (see below), whose sum is σ = 40046268416. Its totient is φ = 23850687168.

The previous prime is 31330220989. The next prime is 31330221017. The reversal of 31330221013 is 31012203313.

It is not a de Polignac number, because 31330221013 - 2¹³ = 31330212821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330221017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202420 + ... + 321922.

It is an arithmetic number, because the mean of its divisors is an integer number (1251445888).

Almost surely, 2^31330221013 is an apocalyptic number.

It is an amenable number.

31330221013 is a deficient number, since it is larger than the sum of its proper divisors (8716047403).

31330221013 is a wasteful number, since it uses less digits than its factorization.

31330221013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119633.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31330221013 its reverse (31012203313), we get a palindrome (62342424326).

The spelling of 31330221013 in words is "thirty-one billion, three hundred thirty million, two hundred twenty-one thousand, thirteen".