21210201110011 has 4 divisors (see below), whose sum is σ = 22132383766992. Its totient is φ = 20288018453032.

The previous prime is 21210201110003. The next prime is 21210201110023. The reversal of 21210201110011 is 11001110201212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21210201110011 - 2³ = 21210201110003 is a prime.

It is a super-2 number, since 2×21210201110011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210201109973 and 21210201110000.

It is not an unprimeable number, because it can be changed into a prime (21210201110051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461091328456 + ... + 461091328501.

It is an arithmetic number, because the mean of its divisors is an integer number (5533095941748).

Almost surely, 2^{21210201110011} is an apocalyptic number.

21210201110011 is a deficient number, since it is larger than the sum of its proper divisors (922182656981).

21210201110011 is an equidigital number, since it uses as much as digits as its factorization.

21210201110011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922182656980.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21210201110011 its reverse (11001110201212), we get a palindrome (32211311311223).

The spelling of 21210201110011 in words is "twenty-one trillion, two hundred ten billion, two hundred one million, one hundred ten thousand, eleven".