21010404211 has 8 divisors (see below), whose sum is σ = 21057430464. Its totient is φ = 20963405160.

The previous prime is 21010404167. The next prime is 21010404353. The reversal of 21010404211 is 11240401012.

It is a happy number.

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 21010404211 - 2¹³ = 21010396019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010404511) 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, 2574840 + ... + 2582986.

It is an arithmetic number, because the mean of its divisors is an integer number (2632178808).

Almost surely, 2^21010404211 is an apocalyptic number.

21010404211 is a deficient number, since it is larger than the sum of its proper divisors (47026253).

21010404211 is an equidigital number, since it uses as much as digits as its factorization.

21010404211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13601.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21010404211 its reverse (11240401012), we get a palindrome (32250805223).

The spelling of 21010404211 in words is "twenty-one billion, ten million, four hundred four thousand, two hundred eleven".