21211011211011 has 8 divisors (see below), whose sum is σ = 28394022976704. Its totient is φ = 14084336793000.

The previous prime is 21211011211001. The next prime is 21211011211051. The reversal of 21211011211011 is 11011211011212.

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

It is not a de Polignac number, because 21211011211011 - 2⁵ = 21211011210979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211011211001) 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, 14084336041 + ... + 14084337546.

It is an arithmetic number, because the mean of its divisors is an integer number (3549252872088).

Almost surely, 2^{21211011211011} is an apocalyptic number.

21211011211011 is a deficient number, since it is larger than the sum of its proper divisors (7183011765693).

21211011211011 is a wasteful number, since it uses less digits than its factorization.

21211011211011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28168673841.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21211011211011 its reverse (11011211011212), we get a palindrome (32222222222223).

It can be divided in two parts, 212 and 11011211011, that multiplied together give a palindrome (2334376734332).

The spelling of 21211011211011 in words is "twenty-one trillion, two hundred eleven billion, eleven million, two hundred eleven thousand, eleven".