21211201100011 has 8 divisors (see below), whose sum is σ = 22843071350064. Its totient is φ = 19579365049440.

The previous prime is 21211201100003. The next prime is 21211201100051. The reversal of 21211201100011 is 11000110211212.

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 21211201100011 - 2³ = 21211201100003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211201099964 and 21211201100000.

It is not an unprimeable number, because it can be changed into a prime (21211201100051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7254445 + ... + 9749326.

It is an arithmetic number, because the mean of its divisors is an integer number (2855383918758).

Almost surely, 2^{21211201100011} is an apocalyptic number.

21211201100011 is a deficient number, since it is larger than the sum of its proper divisors (1631870250053).

21211201100011 is a wasteful number, since it uses less digits than its factorization.

21211201100011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17099741.

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

Adding to 21211201100011 its reverse (11000110211212), we get a palindrome (32211311311223).

The spelling of 21211201100011 in words is "twenty-one trillion, two hundred eleven billion, two hundred one million, one hundred thousand, eleven".