21125330203 has 2 divisors, whose sum is σ = 21125330204. Its totient is φ = 21125330202.

The previous prime is 21125330189. The next prime is 21125330231. The reversal of 21125330203 is 30203352112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21125330203 is a prime.

It is not a weakly prime, because it can be changed into another prime (21125336203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10562665101 + 10562665102.

It is an arithmetic number, because the mean of its divisors is an integer number (10562665102).

Almost surely, 2^21125330203 is an apocalyptic number.

21125330203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21125330203 is an equidigital number, since it uses as much as digits as its factorization.

21125330203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21125330203 its reverse (30203352112), we get a palindrome (51328682315).

The spelling of 21125330203 in words is "twenty-one billion, one hundred twenty-five million, three hundred thirty thousand, two hundred three".