21888541722 has 16 divisors (see below), whose sum is σ = 44795155680. Its totient is φ = 7126501872.

The previous prime is 21888541667. The next prime is 21888541723. The reversal of 21888541722 is 22714588812.

It is a super-3 number, since 3×21888541722³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21888541723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42419397 + ... + 42419912.

It is an arithmetic number, because the mean of its divisors is an integer number (2799697230).

Almost surely, 2^21888541722 is an apocalyptic number.

21888541722 is an abundant number, since it is smaller than the sum of its proper divisors (22906613958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21888541722 is a wasteful number, since it uses less digits than its factorization.

21888541722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84839357.

The product of its digits is 573440, while the sum is 48.

The spelling of 21888541722 in words is "twenty-one billion, eight hundred eighty-eight million, five hundred forty-one thousand, seven hundred twenty-two".