268140821 has 8 divisors (see below), whose sum is σ = 290364984. Its totient is φ = 246144960.

The previous prime is 268140797. The next prime is 268140841. The reversal of 268140821 is 128041862.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2907025 + 265233796 = 1705^2 + 16286^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268140821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268140841) 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, 54626 + ... + 59331.

It is an arithmetic number, because the mean of its divisors is an integer number (36295623).

Almost surely, 2^268140821 is an apocalyptic number.

It is an amenable number.

268140821 is a deficient number, since it is larger than the sum of its proper divisors (22224163).

268140821 is a wasteful number, since it uses less digits than its factorization.

268140821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114151.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 268140821 is about 16375.0059847317. The cubic root of 268140821 is about 644.8434778342.

The spelling of 268140821 in words is "two hundred sixty-eight million, one hundred forty thousand, eight hundred twenty-one".