21356211550603 has 16 divisors (see below), whose sum is σ = 21426006168000. Its totient is φ = 21286527897600.

The previous prime is 21356211550561. The next prime is 21356211550631. The reversal of 21356211550603 is 30605511265312.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21356211550603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21356211550703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2564074543 + ... + 2564082871.

It is an arithmetic number, because the mean of its divisors is an integer number (1339125385500).

Almost surely, 2^{21356211550603} is an apocalyptic number.

21356211550603 is a deficient number, since it is larger than the sum of its proper divisors (69794617397).

21356211550603 is a wasteful number, since it uses less digits than its factorization.

21356211550603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14022.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 21356211550603 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred eleven million, five hundred fifty thousand, six hundred three".