21013034101 has 4 divisors (see below), whose sum is σ = 21037554252. Its totient is φ = 20988513952.

The previous prime is 21013034099. The next prime is 21013034111. The reversal of 21013034101 is 10143031012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16071647076 + 4941387025 = 126774^2 + 70295^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013034101 - 2¹ = 21013034099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013034111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12258790 + ... + 12260503.

It is an arithmetic number, because the mean of its divisors is an integer number (5259388563).

Almost surely, 2^21013034101 is an apocalyptic number.

It is an amenable number.

21013034101 is a deficient number, since it is larger than the sum of its proper divisors (24520151).

21013034101 is an equidigital number, since it uses as much as digits as its factorization.

21013034101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24520150.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21013034101 its reverse (10143031012), we get a palindrome (31156065113).

The spelling of 21013034101 in words is "twenty-one billion, thirteen million, thirty-four thousand, one hundred one".