21043031101 has 8 divisors (see below), whose sum is σ = 21559696704. Its totient is φ = 20526528480.

The previous prime is 21043031099. The next prime is 21043031117. The reversal of 21043031101 is 10113034012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21043031101 - 2¹ = 21043031099 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 (21043031501) 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 7 ways as a sum of consecutive naturals, for example, 244920 + ... + 319486.

It is an arithmetic number, because the mean of its divisors is an integer number (2694962088).

Almost surely, 2^21043031101 is an apocalyptic number.

It is an amenable number.

21043031101 is a deficient number, since it is larger than the sum of its proper divisors (516665603).

21043031101 is an equidigital number, since it uses as much as digits as its factorization.

21043031101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81491.

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

Adding to 21043031101 its reverse (10113034012), we get a palindrome (31156065113).

The spelling of 21043031101 in words is "twenty-one billion, forty-three million, thirty-one thousand, one hundred one".