21044120123243 has 8 divisors (see below), whose sum is σ = 24609735161088. Its totient is φ = 17618333126184.

The previous prime is 21044120123237. The next prime is 21044120123297. The reversal of 21044120123243 is 34232102144012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21044120123243 - 2¹⁴ = 21044120106859 is a prime.

It is a super-2 number, since 2×21044120123243² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21044120123203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34957009871 + ... + 34957010472.

It is an arithmetic number, because the mean of its divisors is an integer number (3076216895136).

Almost surely, 2^{21044120123243} is an apocalyptic number.

21044120123243 is a deficient number, since it is larger than the sum of its proper divisors (3565615037845).

21044120123243 is an equidigital number, since it uses as much as digits as its factorization.

21044120123243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69914020393.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 21044120123243 its reverse (34232102144012), we get a palindrome (55276222267255).

The spelling of 21044120123243 in words is "twenty-one trillion, forty-four billion, one hundred twenty million, one hundred twenty-three thousand, two hundred forty-three".