21606110501061 has 16 divisors (see below), whose sum is σ = 30508569082944. Its totient is φ = 13554186395904.

The previous prime is 21606110501033. The next prime is 21606110501071. The reversal of 21606110501061 is 16010501160612.

It is not a de Polignac number, because 21606110501061 - 2¹¹ = 21606110499013 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21606110501021) 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 15 ways as a sum of consecutive naturals, for example, 40180615 + ... + 40714788.

It is an arithmetic number, because the mean of its divisors is an integer number (1906785567684).

Almost surely, 2^{21606110501061} is an apocalyptic number.

It is an amenable number.

21606110501061 is a deficient number, since it is larger than the sum of its proper divisors (8902458581883).

21606110501061 is a wasteful number, since it uses less digits than its factorization.

21606110501061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80900660.

The product of its (nonzero) digits is 2160, while the sum is 30.

Adding to 21606110501061 its reverse (16010501160612), we get a palindrome (37616611661673).

The spelling of 21606110501061 in words is "twenty-one trillion, six hundred six billion, one hundred ten million, five hundred one thousand, sixty-one".