21123030011142 has 16 divisors (see below), whose sum is σ = 44731122376752. Its totient is φ = 6626832944640.

The previous prime is 21123030011093. The next prime is 21123030011173. The reversal of 21123030011142 is 24111003032112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103544264659 + ... + 103544264862.

It is an arithmetic number, because the mean of its divisors is an integer number (2795695148547).

Almost surely, 2^{21123030011142} is an apocalyptic number.

21123030011142 is an abundant number, since it is smaller than the sum of its proper divisors (23608092365610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123030011142 is a wasteful number, since it uses less digits than its factorization.

21123030011142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207088529543.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21123030011142 its reverse (24111003032112), we get a palindrome (45234033043254).

The spelling of 21123030011142 in words is "twenty-one trillion, one hundred twenty-three billion, thirty million, eleven thousand, one hundred forty-two".