221268120681 has 4 divisors (see below), whose sum is σ = 295024160912. Its totient is φ = 147512080452.

The previous prime is 221268120631. The next prime is 221268120683. The reversal of 221268120681 is 186021862122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221268120681 - 2⁷ = 221268120553 is a prime.

It is a super-2 number, since 2×221268120681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221268120683) 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, 36878020111 + ... + 36878020116.

It is an arithmetic number, because the mean of its divisors is an integer number (73756040228).

Almost surely, 2^221268120681 is an apocalyptic number.

It is an amenable number.

221268120681 is a deficient number, since it is larger than the sum of its proper divisors (73756040231).

221268120681 is an equidigital number, since it uses as much as digits as its factorization.

221268120681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73756040230.

The product of its (nonzero) digits is 36864, while the sum is 39.

The spelling of 221268120681 in words is "two hundred twenty-one billion, two hundred sixty-eight million, one hundred twenty thousand, six hundred eighty-one".