21012012211103 has 2 divisors, whose sum is σ = 21012012211104. Its totient is φ = 21012012211102.

The previous prime is 21012012211093. The next prime is 21012012211129. The reversal of 21012012211103 is 30111221021012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012012211103 - 2⁴² = 16613965699999 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012012219103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506006105551 + 10506006105552.

It is an arithmetic number, because the mean of its divisors is an integer number (10506006105552).

Almost surely, 2^{21012012211103} is an apocalyptic number.

21012012211103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012012211103 is an equidigital number, since it uses as much as digits as its factorization.

21012012211103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21012012211103 its reverse (30111221021012), we get a palindrome (51123233232115).

The spelling of 21012012211103 in words is "twenty-one trillion, twelve billion, twelve million, two hundred eleven thousand, one hundred three".