21111005021203 has 2 divisors, whose sum is σ = 21111005021204. Its totient is φ = 21111005021202.

The previous prime is 21111005021191. The next prime is 21111005021251. The reversal of 21111005021203 is 30212050011112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111005021203 - 2¹³ = 21111005013011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21111005021273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555502510601 + 10555502510602.

It is an arithmetic number, because the mean of its divisors is an integer number (10555502510602).

Almost surely, 2^{21111005021203} is an apocalyptic number.

21111005021203 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111005021203 is an equidigital number, since it uses as much as digits as its factorization.

21111005021203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 21111005021203 its reverse (30212050011112), we get a palindrome (51323055032315).

The spelling of 21111005021203 in words is "twenty-one trillion, one hundred eleven billion, five million, twenty-one thousand, two hundred three".