869343021 has 6 divisors (see below), whose sum is σ = 1255717710. Its totient is φ = 579562008.

The previous prime is 869343001. The next prime is 869343031. The reversal of 869343021 is 120343968.

It can be written as a sum of positive squares in only one way, i.e., 557432100 + 311910921 = 23610^2 + 17661^2 .

It is not a de Polignac number, because 869343021 - 2¹⁰ = 869341997 is a prime.

It is a super-2 number, since 2×869343021² = 1511514576322812882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869343001) 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 5 ways as a sum of consecutive naturals, for example, 48296826 + ... + 48296843.

It is an arithmetic number, because the mean of its divisors is an integer number (209286285).

Almost surely, 2^869343021 is an apocalyptic number.

It is an amenable number.

869343021 is a deficient number, since it is larger than the sum of its proper divisors (386374689).

869343021 is a wasteful number, since it uses less digits than its factorization.

869343021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96593675 (or 96593672 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 869343021 is about 29484.6234671566. The cubic root of 869343021 is about 954.3999121054.

Adding to 869343021 its reverse (120343968), we get a palindrome (989686989).

The spelling of 869343021 in words is "eight hundred sixty-nine million, three hundred forty-three thousand, twenty-one".