21234503203 has 2 divisors, whose sum is σ = 21234503204. Its totient is φ = 21234503202.

The previous prime is 21234503201. The next prime is 21234503219. The reversal of 21234503203 is 30230543212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21234503203 - 2¹ = 21234503201 is a prime.

Together with 21234503201, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21234503201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617251601 + 10617251602.

It is an arithmetic number, because the mean of its divisors is an integer number (10617251602).

Almost surely, 2^21234503203 is an apocalyptic number.

21234503203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234503203 is an equidigital number, since it uses as much as digits as its factorization.

21234503203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 25.

The spelling of 21234503203 in words is "twenty-one billion, two hundred thirty-four million, five hundred three thousand, two hundred three".