21103121210329 has 2 divisors, whose sum is σ = 21103121210330. Its totient is φ = 21103121210328.

The previous prime is 21103121210299. The next prime is 21103121210351. The reversal of 21103121210329 is 92301212130112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21085545610000 + 17575600329 = 4591900^2 + 132573^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103121210329 - 2⁷ = 21103121210201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21103121210297 and 21103121210306.

It is not a weakly prime, because it can be changed into another prime (21103121210929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551560605164 + 10551560605165.

It is an arithmetic number, because the mean of its divisors is an integer number (10551560605165).

Almost surely, 2^{21103121210329} is an apocalyptic number.

It is an amenable number.

21103121210329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103121210329 is an equidigital number, since it uses as much as digits as its factorization.

21103121210329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 21103121210329 in words is "twenty-one trillion, one hundred three billion, one hundred twenty-one million, two hundred ten thousand, three hundred twenty-nine".