21153144203 has 2 divisors, whose sum is σ = 21153144204. Its totient is φ = 21153144202.

The previous prime is 21153144169. The next prime is 21153144223. The reversal of 21153144203 is 30244135112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21153144203 - 2¹⁸ = 21152882059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21153144223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576572101 + 10576572102.

It is an arithmetic number, because the mean of its divisors is an integer number (10576572102).

Almost surely, 2^21153144203 is an apocalyptic number.

21153144203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21153144203 is an equidigital number, since it uses as much as digits as its factorization.

21153144203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21153144203 its reverse (30244135112), we get a palindrome (51397279315).

Subtracting 21153144203 from its reverse (30244135112), we obtain a palindrome (9090990909).

The spelling of 21153144203 in words is "twenty-one billion, one hundred fifty-three million, one hundred forty-four thousand, two hundred three".