21365103046543 has 4 divisors (see below), whose sum is σ = 21365116549920. Its totient is φ = 21365089543168.

The previous prime is 21365103046523. The next prime is 21365103046583. The reversal of 21365103046543 is 34564030156312.

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 21365103046543 - 2⁹ = 21365103046031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21365103046543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365103046523) 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, 4006258 + ... + 7666831.

It is an arithmetic number, because the mean of its divisors is an integer number (5341279137480).

Almost surely, 2^{21365103046543} is an apocalyptic number.

21365103046543 is a deficient number, since it is larger than the sum of its proper divisors (13503377).

21365103046543 is a wasteful number, since it uses less digits than its factorization.

21365103046543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13503376.

The product of its (nonzero) digits is 777600, while the sum is 43.

The spelling of 21365103046543 in words is "twenty-one trillion, three hundred sixty-five billion, one hundred three million, forty-six thousand, five hundred forty-three".