220888911721 has 4 divisors (see below), whose sum is σ = 230492777472. Its totient is φ = 211285045972.

The previous prime is 220888911709. The next prime is 220888911773. The reversal of 220888911721 is 127119888022.

220888911721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 220888911721 - 2²³ = 220880523113 is a prime.

It is a super-2 number, since 2×220888911721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220888911701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4801932841 + ... + 4801932886.

It is an arithmetic number, because the mean of its divisors is an integer number (57623194368).

Almost surely, 2^220888911721 is an apocalyptic number.

It is an amenable number.

220888911721 is a deficient number, since it is larger than the sum of its proper divisors (9603865751).

220888911721 is an equidigital number, since it uses as much as digits as its factorization.

220888911721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9603865750.

The product of its (nonzero) digits is 258048, while the sum is 49.

The spelling of 220888911721 in words is "two hundred twenty billion, eight hundred eighty-eight million, nine hundred eleven thousand, seven hundred twenty-one".