21534055331405 has 16 divisors (see below), whose sum is σ = 25887740828544. Its totient is φ = 17196016326720.

The previous prime is 21534055331377. The next prime is 21534055331423. The reversal of 21534055331405 is 50413355043512.

It is not a de Polignac number, because 21534055331405 - 2⁸ = 21534055331149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6600122 + ... + 9307508.

It is an arithmetic number, because the mean of its divisors is an integer number (1617983801784).

Almost surely, 2^{21534055331405} is an apocalyptic number.

It is an amenable number.

21534055331405 is a deficient number, since it is larger than the sum of its proper divisors (4353685497139).

21534055331405 is a wasteful number, since it uses less digits than its factorization.

21534055331405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2710276.

The product of its (nonzero) digits is 540000, while the sum is 41.

The spelling of 21534055331405 in words is "twenty-one trillion, five hundred thirty-four billion, fifty-five million, three hundred thirty-one thousand, four hundred five".