966236821 has 4 divisors (see below), whose sum is σ = 1054076544. Its totient is φ = 878397100.

The previous prime is 966236813. The next prime is 966236879. The reversal of 966236821 is 128632669.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 128632669 = 11 ⋅11693879.

It is a cyclic number.

It is not a de Polignac number, because 966236821 - 2³ = 966236813 is a prime.

It is a super-2 number, since 2×966236821² = 1867227188512372082, which 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 (966236891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43919845 + ... + 43919866.

It is an arithmetic number, because the mean of its divisors is an integer number (263519136).

Almost surely, 2^966236821 is an apocalyptic number.

It is an amenable number.

966236821 is a deficient number, since it is larger than the sum of its proper divisors (87839723).

966236821 is a wasteful number, since it uses less digits than its factorization.

966236821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87839722.

The product of its digits is 186624, while the sum is 43.

The square root of 966236821 is about 31084.3500977582. The cubic root of 966236821 is about 988.6165149735.

The spelling of 966236821 in words is "nine hundred sixty-six million, two hundred thirty-six thousand, eight hundred twenty-one".