21166012761019 has 8 divisors (see below), whose sum is σ = 24530429276928. Its totient is φ = 17886771346920.

The previous prime is 21166012761011. The next prime is 21166012761109. The reversal of 21166012761019 is 91016721066112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21166012761019 - 2³ = 21166012761011 is a prime.

It is a super-2 number, since 2×21166012761019² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21166012761011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21293774917 + ... + 21293775910.

It is an arithmetic number, because the mean of its divisors is an integer number (3066303659616).

Almost surely, 2^{21166012761019} is an apocalyptic number.

21166012761019 is a deficient number, since it is larger than the sum of its proper divisors (3364416515909).

21166012761019 is an equidigital number, since it uses as much as digits as its factorization.

21166012761019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42587550905.

The product of its (nonzero) digits is 54432, while the sum is 43.

The spelling of 21166012761019 in words is "twenty-one trillion, one hundred sixty-six billion, twelve million, seven hundred sixty-one thousand, nineteen".