21031344101 has 4 divisors (see below), whose sum is σ = 21040149900. Its totient is φ = 21022538304.

The previous prime is 21031344071. The next prime is 21031344137. The reversal of 21031344101 is 10144313012.

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 10403796001 + 10627548100 = 101999^2 + 103090^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031344101 - 2¹⁸ = 21031081957 is a prime.

It is a super-3 number, since 3×21031344101³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031344001) 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, 4399316 + ... + 4404093.

It is an arithmetic number, because the mean of its divisors is an integer number (5260037475).

Almost surely, 2^21031344101 is an apocalyptic number.

It is an amenable number.

21031344101 is a deficient number, since it is larger than the sum of its proper divisors (8805799).

21031344101 is an equidigital number, since it uses as much as digits as its factorization.

21031344101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8805798.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21031344101 its reverse (10144313012), we get a palindrome (31175657113).

The spelling of 21031344101 in words is "twenty-one billion, thirty-one million, three hundred forty-four thousand, one hundred one".