996221 has 4 divisors (see below), whose sum is σ = 998844. Its totient is φ = 993600.

The previous prime is 996211. The next prime is 996253. The reversal of 996221 is 122699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122699 = 29 ⋅4231.

It can be written as a sum of positive squares in 2 ways, for example, as 470596 + 525625 = 686^2 + 725^2 .

It is a cyclic number.

It is not a de Polignac number, because 996221 - 2⁶ = 996157 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620 + ... + 1541.

It is an arithmetic number, because the mean of its divisors is an integer number (249711).

2⁹⁹⁶²²¹ is an apocalyptic number.

It is an amenable number.

996221 is a deficient number, since it is larger than the sum of its proper divisors (2623).

996221 is a wasteful number, since it uses less digits than its factorization.

996221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2622.

The product of its digits is 1944, while the sum is 29.

The square root of 996221 is about 998.1087115139. The cubic root of 996221 is about 99.8738743233.

It can be divided in two parts, 996 and 221, that multiplied together give a triangular number (220116 = T₆₆₃).

The spelling of 996221 in words is "nine hundred ninety-six thousand, two hundred twenty-one".