21340001044243 has 32 divisors (see below), whose sum is σ = 25717121740800. Its totient is φ = 17298395541504.

The previous prime is 21340001044237. The next prime is 21340001044247. The reversal of 21340001044243 is 34244010004312.

It is not a de Polignac number, because 21340001044243 - 2¹³ = 21340001036051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21340001044247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 982177246 + ... + 982198972.

It is an arithmetic number, because the mean of its divisors is an integer number (803660054400).

Almost surely, 2^{21340001044243} is an apocalyptic number.

21340001044243 is a deficient number, since it is larger than the sum of its proper divisors (4377120696557).

21340001044243 is a wasteful number, since it uses less digits than its factorization.

21340001044243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34339.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21340001044243 its reverse (34244010004312), we get a palindrome (55584011048555).

The spelling of 21340001044243 in words is "twenty-one trillion, three hundred forty billion, one million, forty-four thousand, two hundred forty-three".