268213621 has 4 divisors (see below), whose sum is σ = 288845452. Its totient is φ = 247581792.

The previous prime is 268213601. The next prime is 268213639. The reversal of 268213621 is 126312862.

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 20151121 + 248062500 = 4489^2 + 15750^2 .

It is a cyclic number.

It is not a de Polignac number, because 268213621 - 2⁷ = 268213493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (268213601) 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, 10315896 + ... + 10315921.

It is an arithmetic number, because the mean of its divisors is an integer number (72211363).

Almost surely, 2^268213621 is an apocalyptic number.

It is an amenable number.

268213621 is a deficient number, since it is larger than the sum of its proper divisors (20631831).

268213621 is a wasteful number, since it uses less digits than its factorization.

268213621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20631830.

The product of its digits is 6912, while the sum is 31.

The square root of 268213621 is about 16377.2287338243. The cubic root of 268213621 is about 644.9018307016.

The spelling of 268213621 in words is "two hundred sixty-eight million, two hundred thirteen thousand, six hundred twenty-one".