21261353454055 has 64 divisors (see below), whose sum is σ = 31568265146880. Its totient is φ = 13514997312000.

The previous prime is 21261353454023. The next prime is 21261353454071. The reversal of 21261353454055 is 55045435316212.

It is not a de Polignac number, because 21261353454055 - 2⁵ = 21261353454023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21261353453996 and 21261353454014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25413444 + ... + 26236726.

It is an arithmetic number, because the mean of its divisors is an integer number (493254142920).

Almost surely, 2^{21261353454055} is an apocalyptic number.

21261353454055 is a deficient number, since it is larger than the sum of its proper divisors (10306911692825).

21261353454055 is a wasteful number, since it uses less digits than its factorization.

21261353454055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825232.

The product of its (nonzero) digits is 2160000, while the sum is 46.

The spelling of 21261353454055 in words is "twenty-one trillion, two hundred sixty-one billion, three hundred fifty-three million, four hundred fifty-four thousand, fifty-five".