21166077743 has 4 divisors (see below), whose sum is σ = 21273519960. Its totient is φ = 21058635528.

The previous prime is 21166077733. The next prime is 21166077763. The reversal of 21166077743 is 34777066112.

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

It is a cyclic number.

It is not a de Polignac number, because 21166077743 - 2⁶ = 21166077679 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21166077694 and 21166077703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21166077733) 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, 53720813 + ... + 53721206.

It is an arithmetic number, because the mean of its divisors is an integer number (5318379990).

Almost surely, 2^21166077743 is an apocalyptic number.

21166077743 is a deficient number, since it is larger than the sum of its proper divisors (107442217).

21166077743 is a wasteful number, since it uses less digits than its factorization.

21166077743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107442216.

The product of its (nonzero) digits is 296352, while the sum is 44.

The spelling of 21166077743 in words is "twenty-one billion, one hundred sixty-six million, seventy-seven thousand, seven hundred forty-three".