21410340273661 has 8 divisors (see below), whose sum is σ = 21462964984440. Its totient is φ = 21357716913408.

The previous prime is 21410340273649. The next prime is 21410340273671. The reversal of 21410340273661 is 16637204301412.

It can be written as a sum of positive squares in 4 ways, for example, as 17154556941636 + 4255783332025 = 4141806^2 + 2062955^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21410340273661 - 2⁹ = 21410340273149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21410340273601) 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, 36278835 + ... + 36864271.

It is an arithmetic number, because the mean of its divisors is an integer number (2682870623055).

Almost surely, 2^{21410340273661} is an apocalyptic number.

It is an amenable number.

21410340273661 is a deficient number, since it is larger than the sum of its proper divisors (52624710779).

21410340273661 is an equidigital number, since it uses as much as digits as its factorization.

21410340273661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675263.

The product of its (nonzero) digits is 145152, while the sum is 40.

The spelling of 21410340273661 in words is "twenty-one trillion, four hundred ten billion, three hundred forty million, two hundred seventy-three thousand, six hundred sixty-one".