21045039205729 has 48 divisors (see below), whose sum is σ = 26716065376000. Its totient is φ = 16225883245440.

The previous prime is 21045039205703. The next prime is 21045039205831. The reversal of 21045039205729 is 92750293054012.

It is not a de Polignac number, because 21045039205729 - 2¹³ = 21045039197537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21045039265729) 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, 66962047 + ... + 67275595.

Almost surely, 2^{21045039205729} is an apocalyptic number.

It is an amenable number.

21045039205729 is a deficient number, since it is larger than the sum of its proper divisors (5671026170271).

21045039205729 is a wasteful number, since it uses less digits than its factorization.

21045039205729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314414 (or 314403 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 21045039205729 in words is "twenty-one trillion, forty-five billion, thirty-nine million, two hundred five thousand, seven hundred twenty-nine".