21030333101 has 4 divisors (see below), whose sum is σ = 21030624252. Its totient is φ = 21030041952.

The previous prime is 21030333067. The next prime is 21030333127. The reversal of 21030333101 is 10133303012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 20128231876 + 902101225 = 141874^2 + 30035^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030333101 - 2²² = 21026138797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21030333101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030333151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53711 + ... + 212003.

It is an arithmetic number, because the mean of its divisors is an integer number (5257656063).

Almost surely, 2^21030333101 is an apocalyptic number.

It is an amenable number.

21030333101 is a deficient number, since it is larger than the sum of its proper divisors (291151).

21030333101 is a wasteful number, since it uses less digits than its factorization.

21030333101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291150.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21030333101 its reverse (10133303012), we get a palindrome (31163636113).

The spelling of 21030333101 in words is "twenty-one billion, thirty million, three hundred thirty-three thousand, one hundred one".