21545000040039 has 16 divisors (see below), whose sum is σ = 32832415868160. Its totient is φ = 12310701238080.

The previous prime is 21545000039999. The next prime is 21545000040049. The reversal of 21545000040039 is 93004000054512.

It is not a de Polignac number, because 21545000040039 - 2²⁵ = 21544966485607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21545000039991 and 21545000040009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21545000040049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29942494 + ... + 30653595.

It is an arithmetic number, because the mean of its divisors is an integer number (2052025991760).

Almost surely, 2^{21545000040039} is an apocalyptic number.

21545000040039 is a deficient number, since it is larger than the sum of its proper divisors (11287415828121).

21545000040039 is a wasteful number, since it uses less digits than its factorization.

21545000040039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60613030.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 21545000040039 in words is "twenty-one trillion, five hundred forty-five billion, forty thousand, thirty-nine".