982573910221 has 4 divisors (see below), whose sum is σ = 982576104444. Its totient is φ = 982571716000.

The previous prime is 982573910189. The next prime is 982573910233. The reversal of 982573910221 is 122019375289.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122019375289 = 7 ⋅17431339327.

It can be written as a sum of positive squares in 2 ways, for example, as 61808920996 + 920764989225 = 248614^2 + 959565^2 .

It is a 3-Lehmer number, since φ(982573910221) divides (982573910221-1)³.

It is a cyclic number.

It is not a de Polignac number, because 982573910221 - 2⁵ = 982573910189 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (982573910291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156730 + ... + 1410571.

It is an arithmetic number, because the mean of its divisors is an integer number (245644026111).

Almost surely, 2^982573910221 is an apocalyptic number.

982573910221 is the 626921-st heptagonal number.

It is an amenable number.

982573910221 is a deficient number, since it is larger than the sum of its proper divisors (2194223).

982573910221 is a wasteful number, since it uses less digits than its factorization.

982573910221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194222.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 982573910221 in words is "nine hundred eighty-two billion, five hundred seventy-three million, nine hundred ten thousand, two hundred twenty-one".