21660550265141 has 4 divisors (see below), whose sum is σ = 21798515553612. Its totient is φ = 21522584976672.

The previous prime is 21660550265131. The next prime is 21660550265177. The reversal of 21660550265141 is 14156205506612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10756989646225 + 10903560618916 = 3279785^2 + 3302054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21660550265141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21660550265092 and 21660550265101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21660550265131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68982644000 + ... + 68982644313.

It is an arithmetic number, because the mean of its divisors is an integer number (5449628888403).

Almost surely, 2^{21660550265141} is an apocalyptic number.

It is an amenable number.

21660550265141 is a deficient number, since it is larger than the sum of its proper divisors (137965288471).

21660550265141 is a wasteful number, since it uses less digits than its factorization.

21660550265141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137965288470.

The product of its (nonzero) digits is 432000, while the sum is 44.

The spelling of 21660550265141 in words is "twenty-one trillion, six hundred sixty billion, five hundred fifty million, two hundred sixty-five thousand, one hundred forty-one".