21616041322445 has 4 divisors (see below), whose sum is σ = 25939249586940. Its totient is φ = 17292833057952.

The previous prime is 21616041322439. The next prime is 21616041322471. The reversal of 21616041322445 is 54422314061612.

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 13345965223369 + 8270076099076 = 3653213^2 + 2875774^2 .

It is a cyclic number.

It is not a de Polignac number, because 21616041322445 - 2⁸ = 21616041322189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2161604132240 + ... + 2161604132249.

It is an arithmetic number, because the mean of its divisors is an integer number (6484812396735).

Almost surely, 2^{21616041322445} is an apocalyptic number.

It is an amenable number.

21616041322445 is a deficient number, since it is larger than the sum of its proper divisors (4323208264495).

21616041322445 is an equidigital number, since it uses as much as digits as its factorization.

21616041322445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4323208264494.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 21616041322445 in words is "twenty-one trillion, six hundred sixteen billion, forty-one million, three hundred twenty-two thousand, four hundred forty-five".