31220221332221 has 8 divisors (see below), whose sum is σ = 32115504758400. Its totient is φ = 30331310030560.

The previous prime is 31220221332191. The next prime is 31220221332331. The reversal of 31220221332221 is 12223312202213.

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 31220221332221 - 2¹⁰ = 31220221331197 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 (31220221322221) 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, 1593021191 + ... + 1593040788.

It is an arithmetic number, because the mean of its divisors is an integer number (4014438094800).

Almost surely, 2^{31220221332221} is an apocalyptic number.

It is an amenable number.

31220221332221 is a deficient number, since it is larger than the sum of its proper divisors (895283426179).

31220221332221 is a wasteful number, since it uses less digits than its factorization.

31220221332221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3186062259.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 31220221332221 its reverse (12223312202213), we get a palindrome (43443533534434).

The spelling of 31220221332221 in words is "thirty-one trillion, two hundred twenty billion, two hundred twenty-one million, three hundred thirty-two thousand, two hundred twenty-one".