21306211065641 has 8 divisors (see below), whose sum is σ = 22563833652000. Its totient is φ = 20049068040768.

The previous prime is 21306211065589. The next prime is 21306211065673. The reversal of 21306211065641 is 14656011260312.

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 21306211065641 - 2⁶ = 21306211065577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21306211065595 and 21306211065604.

It is not an unprimeable number, because it can be changed into a prime (21306211065691) 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, 119798891 + ... + 119976608.

It is an arithmetic number, because the mean of its divisors is an integer number (2820479206500).

Almost surely, 2^{21306211065641} is an apocalyptic number.

It is an amenable number.

21306211065641 is a deficient number, since it is larger than the sum of its proper divisors (1257622586359).

21306211065641 is a wasteful number, since it uses less digits than its factorization.

21306211065641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239780743.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 21306211065641 in words is "twenty-one trillion, three hundred six billion, two hundred eleven million, sixty-five thousand, six hundred forty-one".