21011031221203 has 2 divisors, whose sum is σ = 21011031221204. Its totient is φ = 21011031221202.

The previous prime is 21011031221161. The next prime is 21011031221209. The reversal of 21011031221203 is 30212213011012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011031221203 - 2⁹ = 21011031220691 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011031221209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505515610601 + 10505515610602.

It is an arithmetic number, because the mean of its divisors is an integer number (10505515610602).

Almost surely, 2^{21011031221203} is an apocalyptic number.

21011031221203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011031221203 is an equidigital number, since it uses as much as digits as its factorization.

21011031221203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21011031221203 its reverse (30212213011012), we get a palindrome (51223244232215).

The spelling of 21011031221203 in words is "twenty-one trillion, eleven billion, thirty-one million, two hundred twenty-one thousand, two hundred three".