21001002111203 has 2 divisors, whose sum is σ = 21001002111204. Its totient is φ = 21001002111202.

The previous prime is 21001002111169. The next prime is 21001002111251. The reversal of 21001002111203 is 30211120010012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001002111203 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001002111263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500501055601 + 10500501055602.

It is an arithmetic number, because the mean of its divisors is an integer number (10500501055602).

Almost surely, 2^{21001002111203} is an apocalyptic number.

21001002111203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001002111203 is an equidigital number, since it uses as much as digits as its factorization.

21001002111203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21001002111203 its reverse (30211120010012), we get a palindrome (51212122121215).

The spelling of 21001002111203 in words is "twenty-one trillion, one billion, two million, one hundred eleven thousand, two hundred three".