21365560273103 has 4 divisors (see below), whose sum is σ = 22054771894848. Its totient is φ = 20676348651360.

The previous prime is 21365560273063. The next prime is 21365560273129. The reversal of 21365560273103 is 30137206556312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21365560273103 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 (21365560273153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344605810826 + ... + 344605810887.

It is an arithmetic number, because the mean of its divisors is an integer number (5513692973712).

Almost surely, 2^{21365560273103} is an apocalyptic number.

21365560273103 is a deficient number, since it is larger than the sum of its proper divisors (689211621745).

21365560273103 is an equidigital number, since it uses as much as digits as its factorization.

21365560273103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689211621744.

The product of its (nonzero) digits is 680400, while the sum is 44.

The spelling of 21365560273103 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred sixty million, two hundred seventy-three thousand, one hundred three".