31420324221 has 48 divisors (see below), whose sum is σ = 50331379392. Its totient is φ = 17315274240.

The previous prime is 31420324189. The next prime is 31420324259. The reversal of 31420324221 is 12242302413.

It is a happy number.

It is not a de Polignac number, because 31420324221 - 2⁵ = 31420324189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31420324191 and 31420324200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420320221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 266485 + ... + 365861.

It is an arithmetic number, because the mean of its divisors is an integer number (1048570404).

Almost surely, 2^31420324221 is an apocalyptic number.

It is an amenable number.

31420324221 is a deficient number, since it is larger than the sum of its proper divisors (18911055171).

31420324221 is a wasteful number, since it uses less digits than its factorization.

31420324221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99482 (or 99471 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31420324221 its reverse (12242302413), we get a palindrome (43662626634).

The spelling of 31420324221 in words is "thirty-one billion, four hundred twenty million, three hundred twenty-four thousand, two hundred twenty-one".