21221000210203 has 2 divisors, whose sum is σ = 21221000210204. Its totient is φ = 21221000210202.

The previous prime is 21221000210197. The next prime is 21221000210269. The reversal of 21221000210203 is 30201200012212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221000210203 - 2¹⁷ = 21221000079131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221000210903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610500105101 + 10610500105102.

It is an arithmetic number, because the mean of its divisors is an integer number (10610500105102).

Almost surely, 2^{21221000210203} is an apocalyptic number.

21221000210203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221000210203 is an equidigital number, since it uses as much as digits as its factorization.

21221000210203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21221000210203 its reverse (30201200012212), we get a palindrome (51422200222415).

The spelling of 21221000210203 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred ten thousand, two hundred three".