21154520655241 has 32 divisors (see below), whose sum is σ = 22064972821760. Its totient is φ = 20264609030400.

The previous prime is 21154520655217. The next prime is 21154520655253. The reversal of 21154520655241 is 14255602545112.

It is a cyclic number.

It is not a de Polignac number, because 21154520655241 - 2⁷ = 21154520655113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21154520655271) 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 31 ways as a sum of consecutive naturals, for example, 536937955 + ... + 536977351.

It is an arithmetic number, because the mean of its divisors is an integer number (689530400680).

Almost surely, 2^{21154520655241} is an apocalyptic number.

It is an amenable number.

21154520655241 is a deficient number, since it is larger than the sum of its proper divisors (910452166519).

21154520655241 is a wasteful number, since it uses less digits than its factorization.

21154520655241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40385.

The product of its (nonzero) digits is 480000, while the sum is 43.

The spelling of 21154520655241 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred twenty million, six hundred fifty-five thousand, two hundred forty-one".