21210401311 has 16 divisors (see below), whose sum is σ = 23260608000. Its totient is φ = 19180705600.

The previous prime is 21210401299. The next prime is 21210401351. The reversal of 21210401311 is 11310401212.

It is a cyclic number.

It is not a de Polignac number, because 21210401311 - 2⁵ = 21210401279 is a prime.

It is a super-2 number, since 2×21210401311² (a number of 21 digits) contains 22 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 (21210401351) 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 15 ways as a sum of consecutive naturals, for example, 2753976 + ... + 2761666.

It is an arithmetic number, because the mean of its divisors is an integer number (1453788000).

Almost surely, 2^21210401311 is an apocalyptic number.

21210401311 is a deficient number, since it is larger than the sum of its proper divisors (2050206689).

21210401311 is a wasteful number, since it uses less digits than its factorization.

21210401311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8990.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21210401311 its reverse (11310401212), we get a palindrome (32520802523).

Subtracting from 21210401311 its reverse (11310401212), we obtain a palindrome (9900000099).

The spelling of 21210401311 in words is "twenty-one billion, two hundred ten million, four hundred one thousand, three hundred eleven".