21064543103 has 4 divisors (see below), whose sum is σ = 21078597000. Its totient is φ = 21050489208.

The previous prime is 21064543099. The next prime is 21064543139. The reversal of 21064543103 is 30134546012.

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

It is a cyclic number.

It is not a de Polignac number, because 21064543103 - 2² = 21064543099 is a prime.

It is a super-2 number, since 2×21064543103² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21064543193) 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 3 ways as a sum of consecutive naturals, for example, 7024700 + ... + 7027697.

It is an arithmetic number, because the mean of its divisors is an integer number (5269649250).

Almost surely, 2^21064543103 is an apocalyptic number.

21064543103 is a deficient number, since it is larger than the sum of its proper divisors (14053897).

21064543103 is a wasteful number, since it uses less digits than its factorization.

21064543103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14053896.

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 21064543103 in words is "twenty-one billion, sixty-four million, five hundred forty-three thousand, one hundred three".