31221210011221 has 8 divisors (see below), whose sum is σ = 31507768654560. Its totient is φ = 30934653650352.

The previous prime is 31221210011197. The next prime is 31221210011261. The reversal of 31221210011221 is 12211001212213.

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 31221210011221 - 2⁷ = 31221210011093 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 (31221210011261) 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, 40251366 + ... + 41019688.

It is an arithmetic number, because the mean of its divisors is an integer number (3938471081820).

Almost surely, 2^{31221210011221} is an apocalyptic number.

It is an amenable number.

31221210011221 is a deficient number, since it is larger than the sum of its proper divisors (286558643339).

31221210011221 is a wasteful number, since it uses less digits than its factorization.

31221210011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141235.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 31221210011221 its reverse (12211001212213), we get a palindrome (43432211223434).

The spelling of 31221210011221 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred ten million, eleven thousand, two hundred twenty-one".