21011122201011 has 16 divisors (see below), whose sum is σ = 28611173389824. Its totient is φ = 13709248814624.

The previous prime is 21011122201009. The next prime is 21011122201033. The reversal of 21011122201011 is 11010222111012.

It is a happy number.

It is not a de Polignac number, because 21011122201011 - 2¹ = 21011122201009 is a prime.

It is a super-2 number, since 2×21011122201011² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21011122201051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14674105 + ... + 16042181.

It is an arithmetic number, because the mean of its divisors is an integer number (1788198336864).

Almost surely, 2^{21011122201011} is an apocalyptic number.

21011122201011 is a deficient number, since it is larger than the sum of its proper divisors (7600051188813).

21011122201011 is a wasteful number, since it uses less digits than its factorization.

21011122201011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477050.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011122201011 its reverse (11010222111012), we get a palindrome (32021344312023).

The spelling of 21011122201011 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, two hundred one thousand, eleven".