21124122120211 has 16 divisors (see below), whose sum is σ = 23571407236608. Its totient is φ = 18765926301600.

The previous prime is 21124122120149. The next prime is 21124122120221. The reversal of 21124122120211 is 11202122142112.

It is a cyclic number.

It is not a de Polignac number, because 21124122120211 - 2¹¹ = 21124122118163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21124122120221) 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, 31439760 + ... + 32104621.

It is an arithmetic number, because the mean of its divisors is an integer number (1473212952288).

Almost surely, 2^{21124122120211} is an apocalyptic number.

21124122120211 is a deficient number, since it is larger than the sum of its proper divisors (2447285116397).

21124122120211 is a wasteful number, since it uses less digits than its factorization.

21124122120211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63545082.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 21124122120211 its reverse (11202122142112), we get a palindrome (32326244262323).

The spelling of 21124122120211 in words is "twenty-one trillion, one hundred twenty-four billion, one hundred twenty-two million, one hundred twenty thousand, two hundred eleven".