21211121011101 has 32 divisors (see below), whose sum is σ = 34232140293120. Its totient is φ = 11404610009856.

The previous prime is 21211121011099. The next prime is 21211121011109. The reversal of 21211121011101 is 10111012111212.

It is not a de Polignac number, because 21211121011101 - 2¹ = 21211121011099 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211121011109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6610471 + ... + 9280116.

It is an arithmetic number, because the mean of its divisors is an integer number (1069754384160).

Almost surely, 2^{21211121011101} is an apocalyptic number.

21211121011101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21211121011101 is a deficient number, since it is larger than the sum of its proper divisors (13021019282019).

21211121011101 is a wasteful number, since it uses less digits than its factorization.

21211121011101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15894353.

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

Adding to 21211121011101 its reverse (10111012111212), we get a palindrome (31322133122313).

The spelling of 21211121011101 in words is "twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, eleven thousand, one hundred one".