21120213203 has 2 divisors, whose sum is σ = 21120213204. Its totient is φ = 21120213202.

The previous prime is 21120213193. The next prime is 21120213239. The reversal of 21120213203 is 30231202112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120213203 - 2¹⁶ = 21120147667 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120213403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560106601 + 10560106602.

It is an arithmetic number, because the mean of its divisors is an integer number (10560106602).

Almost surely, 2^21120213203 is an apocalyptic number.

21120213203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120213203 is an equidigital number, since it uses as much as digits as its factorization.

21120213203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21120213203 its reverse (30231202112), we get a palindrome (51351415315).

The spelling of 21120213203 in words is "twenty-one billion, one hundred twenty million, two hundred thirteen thousand, two hundred three".