268222067821 has 4 divisors (see below), whose sum is σ = 269772484572. Its totient is φ = 266671651072.

The previous prime is 268222067791. The next prime is 268222067891. The reversal of 268222067821 is 128760222862.

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 256252613796 + 11969454025 = 506214^2 + 109405^2 .

It is a cyclic number.

It is not a de Polignac number, because 268222067821 - 2³¹ = 266074584173 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 (268222067891) 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, 775208116 + ... + 775208461.

It is an arithmetic number, because the mean of its divisors is an integer number (67443121143).

Almost surely, 2^268222067821 is an apocalyptic number.

It is an amenable number.

268222067821 is a deficient number, since it is larger than the sum of its proper divisors (1550416751).

268222067821 is a wasteful number, since it uses less digits than its factorization.

268222067821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550416750.

The product of its (nonzero) digits is 516096, while the sum is 46.

The spelling of 268222067821 in words is "two hundred sixty-eight billion, two hundred twenty-two million, sixty-seven thousand, eight hundred twenty-one".