21611726377377 has 64 divisors (see below), whose sum is σ = 30010138454016. Its totient is φ = 13824606781440.

The previous prime is 21611726377343. The next prime is 21611726377433. The reversal of 21611726377377 is 77377362711612.

It is not a de Polignac number, because 21611726377377 - 2¹¹ = 21611726375329 is a prime.

It is a super-2 number, since 2×21611726377377² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21611726377377.

It is not an unprimeable number, because it can be changed into a prime (21611726378377) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 970125163 + ... + 970147439.

It is an arithmetic number, because the mean of its divisors is an integer number (468908413344).

Almost surely, 2^{21611726377377} is an apocalyptic number.

It is an amenable number.

21611726377377 is a deficient number, since it is larger than the sum of its proper divisors (8398412076639).

21611726377377 is a wasteful number, since it uses less digits than its factorization.

21611726377377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22970.

The product of its digits is 21781872, while the sum is 60.

The spelling of 21611726377377 in words is "twenty-one trillion, six hundred eleven billion, seven hundred twenty-six million, three hundred seventy-seven thousand, three hundred seventy-seven".