21011321110103 has 2 divisors, whose sum is σ = 21011321110104. Its totient is φ = 21011321110102.

The previous prime is 21011321110093. The next prime is 21011321110123. The reversal of 21011321110103 is 30101112311012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21011321110103 - 2¹² = 21011321106007 is a prime.

It is a super-2 number, since 2×21011321110103² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011321110123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505660555051 + 10505660555052.

It is an arithmetic number, because the mean of its divisors is an integer number (10505660555052).

Almost surely, 2^{21011321110103} is an apocalyptic number.

21011321110103 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011321110103 is an equidigital number, since it uses as much as digits as its factorization.

21011321110103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 21011321110103 its reverse (30101112311012), we get a palindrome (51112433421115).

The spelling of 21011321110103 in words is "twenty-one trillion, eleven billion, three hundred twenty-one million, one hundred ten thousand, one hundred three".