21122013031123 has 4 divisors (see below), whose sum is σ = 21122925097680. Its totient is φ = 21121100964568.

The previous prime is 21122013031001. The next prime is 21122013031129. The reversal of 21122013031123 is 32113031022112.

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 21122013031123 - 2⁹ = 21122013030611 is a prime.

It is a super-2 number, since 2×21122013031123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21122013031094 and 21122013031103.

It is not an unprimeable number, because it can be changed into a prime (21122013031129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455998540 + ... + 456044857.

It is an arithmetic number, because the mean of its divisors is an integer number (5280731274420).

Almost surely, 2^{21122013031123} is an apocalyptic number.

21122013031123 is a deficient number, since it is larger than the sum of its proper divisors (912066557).

21122013031123 is an equidigital number, since it uses as much as digits as its factorization.

21122013031123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912066556.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21122013031123 its reverse (32113031022112), we get a palindrome (53235044053235).

The spelling of 21122013031123 in words is "twenty-one trillion, one hundred twenty-two billion, thirteen million, thirty-one thousand, one hundred twenty-three".