21534502534405 has 8 divisors (see below), whose sum is σ = 29533032047232. Its totient is φ = 14766516023568.

The previous prime is 21534502534339. The next prime is 21534502534409. The reversal of 21534502534405 is 50443520543512.

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

It is a cyclic number.

It is not a de Polignac number, because 21534502534405 - 2⁷ = 21534502534277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534502534409) 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, 307635750457 + ... + 307635750526.

It is an arithmetic number, because the mean of its divisors is an integer number (3691629005904).

Almost surely, 2^{21534502534405} is an apocalyptic number.

It is an amenable number.

21534502534405 is a deficient number, since it is larger than the sum of its proper divisors (7998529512827).

21534502534405 is an equidigital number, since it uses as much as digits as its factorization.

21534502534405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615271500995.

The product of its (nonzero) digits is 1440000, while the sum is 43.

The spelling of 21534502534405 in words is "twenty-one trillion, five hundred thirty-four billion, five hundred two million, five hundred thirty-four thousand, four hundred five".