21043130525203 has 4 divisors (see below), whose sum is σ = 22150663710760. Its totient is φ = 19935597339648.

The previous prime is 21043130525119. The next prime is 21043130525269. The reversal of 21043130525203 is 30252503134012.

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-21043130525203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043130525003) 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, 553766592750 + ... + 553766592787.

It is an arithmetic number, because the mean of its divisors is an integer number (5537665927690).

Almost surely, 2^{21043130525203} is an apocalyptic number.

21043130525203 is a deficient number, since it is larger than the sum of its proper divisors (1107533185557).

21043130525203 is a wasteful number, since it uses less digits than its factorization.

21043130525203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107533185556.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 21043130525203 its reverse (30252503134012), we get a palindrome (51295633659215).

The spelling of 21043130525203 in words is "twenty-one trillion, forty-three billion, one hundred thirty million, five hundred twenty-five thousand, two hundred three".