993044444221 has 4 divisors (see below), whose sum is σ = 1019883483292. Its totient is φ = 966205405152.

The previous prime is 993044444213. The next prime is 993044444237. The reversal of 993044444221 is 122444440399.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122444440399 = 701 ⋅174671099.

It can be written as a sum of positive squares in 2 ways, for example, as 375658668100 + 617385776121 = 612910^2 + 785739^2 .

It is a cyclic number.

It is not a de Polignac number, because 993044444221 - 2³ = 993044444213 is a prime.

It is a super-2 number, since 2×993044444221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993044444251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13419519480 + ... + 13419519553.

It is an arithmetic number, because the mean of its divisors is an integer number (254970870823).

Almost surely, 2^993044444221 is an apocalyptic number.

It is an amenable number.

993044444221 is a deficient number, since it is larger than the sum of its proper divisors (26839039071).

993044444221 is a wasteful number, since it uses less digits than its factorization.

993044444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26839039070.

The product of its (nonzero) digits is 995328, while the sum is 46.

The spelling of 993044444221 in words is "nine hundred ninety-three billion, forty-four million, four hundred forty-four thousand, two hundred twenty-one".