21011101021011 has 24 divisors (see below), whose sum is σ = 29760889480560. Its totient is φ = 13182894771712.

The previous prime is 21011101020941. The next prime is 21011101021037. The reversal of 21011101021011 is 11012010111012.

It is not a de Polignac number, because 21011101021011 - 2⁹ = 21011101020499 is a prime.

It is a super-2 number, since 2×21011101021011² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21011101021061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21180565 + ... + 22150361.

It is an arithmetic number, because the mean of its divisors is an integer number (1240037061690).

Almost surely, 2^{21011101021011} is an apocalyptic number.

21011101021011 is a deficient number, since it is larger than the sum of its proper divisors (8749788459549).

21011101021011 is a wasteful number, since it uses less digits than its factorization.

21011101021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994823 (or 994806 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21011101021011 its reverse (11012010111012), we get a palindrome (32023111132023).

Subtracting from 21011101021011 its reverse (11012010111012), we obtain a palindrome (9999090909999).

The spelling of 21011101021011 in words is "twenty-one trillion, eleven billion, one hundred one million, twenty-one thousand, eleven".