867021121 has 4 divisors (see below), whose sum is σ = 881234644. Its totient is φ = 852807600.

The previous prime is 867021119. The next prime is 867021139. The reversal of 867021121 is 121120768.

867021121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 491242896 + 375778225 = 22164^2 + 19385^2 .

It is a cyclic number.

It is not a de Polignac number, because 867021121 - 2¹ = 867021119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 867021121.

It is not an unprimeable number, because it can be changed into a prime (867021161) 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, 7106670 + ... + 7106791.

It is an arithmetic number, because the mean of its divisors is an integer number (220308661).

Almost surely, 2^867021121 is an apocalyptic number.

It is an amenable number.

867021121 is a deficient number, since it is larger than the sum of its proper divisors (14213523).

867021121 is a wasteful number, since it uses less digits than its factorization.

867021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14213522.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 867021121 is about 29445.2223798700. Note that the first 3 decimals coincide. The cubic root of 867021121 is about 953.5494626148.

Adding to 867021121 its reverse (121120768), we get a palindrome (988141889).

It can be divided in two parts, 8670 and 21121, that added together give a cube (29791 = 31³).

The spelling of 867021121 in words is "eight hundred sixty-seven million, twenty-one thousand, one hundred twenty-one".