21103530001 has 2 divisors, whose sum is σ = 21103530002. Its totient is φ = 21103530000.

The previous prime is 21103529987. The next prime is 21103530011. The reversal of 21103530001 is 10003530112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13478049025 + 7625480976 = 116095^2 + 87324^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103530001 - 2¹¹ = 21103527953 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103530011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551765000 + 10551765001.

It is an arithmetic number, because the mean of its divisors is an integer number (10551765001).

Almost surely, 2^21103530001 is an apocalyptic number.

It is an amenable number.

21103530001 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103530001 is an equidigital number, since it uses as much as digits as its factorization.

21103530001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 16.

The spelling of 21103530001 in words is "twenty-one billion, one hundred three million, five hundred thirty thousand, one".