31321010221 has 8 divisors (see below), whose sum is σ = 31915728864. Its totient is φ = 30726430800.

The previous prime is 31321010197. The next prime is 31321010249. The reversal of 31321010221 is 12201012313.

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 31321010221 - 2²¹ = 31318913069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31321010195 and 31321010204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321010291) 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, 495246 + ... + 554896.

It is an arithmetic number, because the mean of its divisors is an integer number (3989466108).

Almost surely, 2^31321010221 is an apocalyptic number.

It is an amenable number.

31321010221 is a deficient number, since it is larger than the sum of its proper divisors (594718643).

31321010221 is an equidigital number, since it uses as much as digits as its factorization.

31321010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69611.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31321010221 its reverse (12201012313), we get a palindrome (43522022534).

The spelling of 31321010221 in words is "thirty-one billion, three hundred twenty-one million, ten thousand, two hundred twenty-one".