1068158821 has 4 divisors (see below), whose sum is σ = 1072823500. Its totient is φ = 1063494144.

The previous prime is 1068158803. The next prime is 1068158867. The reversal of 1068158821 is 1288518601.

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 979064100 + 89094721 = 31290^2 + 9439^2 .

It is a cyclic number.

It is not a de Polignac number, because 1068158821 - 2⁹ = 1068158309 is a prime.

It is a super-2 number, since 2×1068158821² = 2281926533760220082, 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 (1068158521) 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, 2331996 + ... + 2332453.

It is an arithmetic number, because the mean of its divisors is an integer number (268205875).

Almost surely, 2^1068158821 is an apocalyptic number.

It is an amenable number.

1068158821 is a deficient number, since it is larger than the sum of its proper divisors (4664679).

1068158821 is an equidigital number, since it uses as much as digits as its factorization.

1068158821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4664678.

The product of its (nonzero) digits is 30720, while the sum is 40.

The square root of 1068158821 is about 32682.6991082438. The cubic root of 1068158821 is about 1022.2221261767. Note that the first 3 decimals are identical.

The spelling of 1068158821 in words is "one billion, sixty-eight million, one hundred fifty-eight thousand, eight hundred twenty-one".