867242021 has 8 divisors (see below), whose sum is σ = 884051064. Its totient is φ = 850449600.

The previous prime is 867242009. The next prime is 867242069. The reversal of 867242021 is 120242768.

It can be written as a sum of positive squares in 4 ways, for example, as 231496225 + 635745796 = 15215^2 + 25214^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 867242021 - 2¹⁴ = 867225637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867242521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172475 + ... + 177431.

It is an arithmetic number, because the mean of its divisors is an integer number (110506383).

Almost surely, 2^867242021 is an apocalyptic number.

It is an amenable number.

867242021 is a deficient number, since it is larger than the sum of its proper divisors (16809043).

867242021 is a wasteful number, since it uses less digits than its factorization.

867242021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8311.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 867242021 is about 29448.9731739495. The cubic root of 867242021 is about 953.6304376471.

Adding to 867242021 its reverse (120242768), we get a palindrome (987484789).

The spelling of 867242021 in words is "eight hundred sixty-seven million, two hundred forty-two thousand, twenty-one".