21122001011123 has 4 divisors (see below), whose sum is σ = 21238697149488. Its totient is φ = 21005304872760.

The previous prime is 21122001011099. The next prime is 21122001011197. The reversal of 21122001011123 is 32111010022112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21122001011123 - 2²⁶ = 21121933902259 is a prime.

It is a super-2 number, since 2×21122001011123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122001011723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58348068911 + ... + 58348069272.

It is an arithmetic number, because the mean of its divisors is an integer number (5309674287372).

Almost surely, 2^{21122001011123} is an apocalyptic number.

21122001011123 is a deficient number, since it is larger than the sum of its proper divisors (116696138365).

21122001011123 is a wasteful number, since it uses less digits than its factorization.

21122001011123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116696138364.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21122001011123 its reverse (32111010022112), we get a palindrome (53233011033235).

The spelling of 21122001011123 in words is "twenty-one trillion, one hundred twenty-two billion, one million, eleven thousand, one hundred twenty-three".