31430201221 has 8 divisors (see below), whose sum is σ = 31774641920. Its totient is φ = 31086177408.

The previous prime is 31430201219. The next prime is 31430201233. The reversal of 31430201221 is 12210203413.

It is a happy number.

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 31430201221 - 2¹ = 31430201219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31430601221) 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, 48610 + ... + 255388.

It is an arithmetic number, because the mean of its divisors is an integer number (3971830240).

Almost surely, 2^31430201221 is an apocalyptic number.

It is an amenable number.

31430201221 is a deficient number, since it is larger than the sum of its proper divisors (344440699).

31430201221 is a wasteful number, since it uses less digits than its factorization.

31430201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208443.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31430201221 its reverse (12210203413), we get a palindrome (43640404634).

The spelling of 31430201221 in words is "thirty-one billion, four hundred thirty million, two hundred one thousand, two hundred twenty-one".