21123130441142 has 4 divisors (see below), whose sum is σ = 31684695661716. Its totient is φ = 10561565220570.

The previous prime is 21123130441129. The next prime is 21123130441157. The reversal of 21123130441142 is 24114403132112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280782610284 + ... + 5280782610287.

It is an arithmetic number, because the mean of its divisors is an integer number (7921173915429).

Almost surely, 2^{21123130441142} is an apocalyptic number.

21123130441142 is a deficient number, since it is larger than the sum of its proper divisors (10561565220574).

21123130441142 is a wasteful number, since it uses less digits than its factorization.

21123130441142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561565220573.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 21123130441142 its reverse (24114403132112), we get a palindrome (45237533573254).

The spelling of 21123130441142 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred thirty million, four hundred forty-one thousand, one hundred forty-two".