21354550476055 has 16 divisors (see below), whose sum is σ = 25655070744288. Its totient is φ = 17063909200000.

The previous prime is 21354550476043. The next prime is 21354550476067. The reversal of 21354550476055 is 55067405545312.

It is an interprime number because it is at equal distance from previous prime (21354550476043) and next prime (21354550476067).

It is not a de Polignac number, because 21354550476055 - 2⁵ = 21354550476023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21354550475993 and 21354550476011.

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, 18640965 + ... + 19753345.

It is an arithmetic number, because the mean of its divisors is an integer number (1603441921518).

Almost surely, 2^{21354550476055} is an apocalyptic number.

21354550476055 is a deficient number, since it is larger than the sum of its proper divisors (4300520268233).

21354550476055 is a wasteful number, since it uses less digits than its factorization.

21354550476055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116818.

The product of its (nonzero) digits is 12600000, while the sum is 52.

The spelling of 21354550476055 in words is "twenty-one trillion, three hundred fifty-four billion, five hundred fifty million, four hundred seventy-six thousand, fifty-five".