21300103031021 has 2 divisors, whose sum is σ = 21300103031022. Its totient is φ = 21300103031020.

The previous prime is 21300103030981. The next prime is 21300103031033. The reversal of 21300103031021 is 12013030100312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21240622650025 + 59480380996 = 4608755^2 + 243886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300103031021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21300103031071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650051515510 + 10650051515511.

It is an arithmetic number, because the mean of its divisors is an integer number (10650051515511).

Almost surely, 2^{21300103031021} is an apocalyptic number.

It is an amenable number.

21300103031021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300103031021 is an equidigital number, since it uses as much as digits as its factorization.

21300103031021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21300103031021 its reverse (12013030100312), we get a palindrome (33313133131333).

The spelling of 21300103031021 in words is "twenty-one trillion, three hundred billion, one hundred three million, thirty-one thousand, twenty-one".