268641021 has 16 divisors (see below), whose sum is σ = 413736768. Its totient is φ = 153235200.

The previous prime is 268641017. The next prime is 268641059. The reversal of 268641021 is 120146862.

It is not a de Polignac number, because 268641021 - 2² = 268641017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 268641021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268641091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238870 + ... + 239991.

It is an arithmetic number, because the mean of its divisors is an integer number (25858548).

Almost surely, 2^268641021 is an apocalyptic number.

It is an amenable number.

268641021 is a deficient number, since it is larger than the sum of its proper divisors (145095747).

268641021 is a wasteful number, since it uses less digits than its factorization.

268641021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478892.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 268641021 is about 16390.2721453916. The cubic root of 268641021 is about 645.2442005439.

Adding to 268641021 its reverse (120146862), we get a palindrome (388787883).

The spelling of 268641021 in words is "two hundred sixty-eight million, six hundred forty-one thousand, twenty-one".