21210111101203 has 2 divisors, whose sum is σ = 21210111101204. Its totient is φ = 21210111101202.

The previous prime is 21210111101197. The next prime is 21210111101227. The reversal of 21210111101203 is 30210111101212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210111101203 - 2³⁷ = 21072672147731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210111101503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605055550601 + 10605055550602.

It is an arithmetic number, because the mean of its divisors is an integer number (10605055550602).

Almost surely, 2^{21210111101203} is an apocalyptic number.

21210111101203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210111101203 is an equidigital number, since it uses as much as digits as its factorization.

21210111101203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21210111101203 its reverse (30210111101212), we get a palindrome (51420222202415).

Subtracting 21210111101203 from its reverse (30210111101212), we obtain a palindrome (9000000000009).

The spelling of 21210111101203 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred one thousand, two hundred three".