21103120001 has 2 divisors, whose sum is σ = 21103120002. Its totient is φ = 21103120000.

The previous prime is 21103119959. The next prime is 21103120009. The reversal of 21103120001 is 10002130112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18181825600 + 2921294401 = 134840^2 + 54049^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103120001 - 2¹⁴ = 21103103617 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103120009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551560000 + 10551560001.

It is an arithmetic number, because the mean of its divisors is an integer number (10551560001).

Almost surely, 2^21103120001 is an apocalyptic number.

It is an amenable number.

21103120001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103120001 is an equidigital number, since it uses as much as digits as its factorization.

21103120001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21103120001 its reverse (10002130112), we get a palindrome (31105250113).

The spelling of 21103120001 in words is "twenty-one billion, one hundred three million, one hundred twenty thousand, one".