971220212221021 has 8 divisors (see below), whose sum is σ = 1109968759215360. Its totient is φ = 832472365824528.

The previous prime is 971220212220961. The next prime is 971220212221027. The reversal of 971220212221021 is 120122212022179.

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 971220212221021 - 2⁹ = 971220212220509 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 (971220212221027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172175506 + ... + 177726883.

It is an arithmetic number, because the mean of its divisors is an integer number (138746094901920).

Almost surely, 2^{971220212221021} is an apocalyptic number.

It is an amenable number.

971220212221021 is a deficient number, since it is larger than the sum of its proper divisors (138748546994339).

971220212221021 is a wasteful number, since it uses less digits than its factorization.

971220212221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350298923.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 971220212221021 in words is "nine hundred seventy-one trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty-one thousand, twenty-one".