21111030423 has 48 divisors (see below), whose sum is σ = 37037632320. Its totient is φ = 11311469568.

The previous prime is 21111030383. The next prime is 21111030431. The reversal of 21111030423 is 32403011112.

21111030423 is a `hidden beast` number, since 211 + 1 + 1 + 0 + 30 + 423 = 666.

It is not a de Polignac number, because 21111030423 - 2⁸ = 21111030167 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111030396 and 21111030405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111030323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 251461 + ... + 324737.

It is an arithmetic number, because the mean of its divisors is an integer number (771617340).

Almost surely, 2^21111030423 is an apocalyptic number.

21111030423 is a deficient number, since it is larger than the sum of its proper divisors (15926601897).

21111030423 is a wasteful number, since it uses less digits than its factorization.

21111030423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73576 (or 73573 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21111030423 its reverse (32403011112), we get a palindrome (53514041535).

The spelling of 21111030423 in words is "twenty-one billion, one hundred eleven million, thirty thousand, four hundred twenty-three".