21702542006543 has 32 divisors (see below), whose sum is σ = 22666929442560. Its totient is φ = 20753634263040.

The previous prime is 21702542006513. The next prime is 21702542006573. The reversal of 21702542006543 is 34560024520712.

It is an interprime number because it is at equal distance from previous prime (21702542006513) and next prime (21702542006573).

It is a cyclic number.

It is not a de Polignac number, because 21702542006543 - 2³² = 21698247039247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21702542006543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21702542006513) 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, 1469657546 + ... + 1469672312.

It is an arithmetic number, because the mean of its divisors is an integer number (708341545080).

Almost surely, 2^{21702542006543} is an apocalyptic number.

21702542006543 is a deficient number, since it is larger than the sum of its proper divisors (964387436017).

21702542006543 is a wasteful number, since it uses less digits than its factorization.

21702542006543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16067.

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 21702542006543 in words is "twenty-one trillion, seven hundred two billion, five hundred forty-two million, six thousand, five hundred forty-three".