21711885345542 has 16 divisors (see below), whose sum is σ = 37387282394112. Its totient is φ = 9263366840520.

The previous prime is 21711885345481. The next prime is 21711885345569. The reversal of 21711885345542 is 24554358811712.

It is a super-3 number, since 3×21711885345542³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3477236684 + ... + 3477242927.

It is an arithmetic number, because the mean of its divisors is an integer number (2336705149632).

Almost surely, 2^{21711885345542} is an apocalyptic number.

21711885345542 is a deficient number, since it is larger than the sum of its proper divisors (15675397048570).

21711885345542 is a wasteful number, since it uses less digits than its factorization.

21711885345542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6954479843.

The product of its digits is 10752000, while the sum is 56.

The spelling of 21711885345542 in words is "twenty-one trillion, seven hundred eleven billion, eight hundred eighty-five million, three hundred forty-five thousand, five hundred forty-two".