21255355615011 has 64 divisors (see below), whose sum is σ = 32682470768640. Its totient is φ = 12036396418560.

The previous prime is 21255355614989. The next prime is 21255355615031. The reversal of 21255355615011 is 11051655355212.

It is not a de Polignac number, because 21255355615011 - 2⁵ = 21255355614979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21255355615031) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2326290235 + ... + 2326299371.

It is an arithmetic number, because the mean of its divisors is an integer number (510663605760).

Almost surely, 2^{21255355615011} is an apocalyptic number.

21255355615011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21255355615011 is a deficient number, since it is larger than the sum of its proper divisors (11427115153629).

21255355615011 is a wasteful number, since it uses less digits than its factorization.

21255355615011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11264.

The product of its (nonzero) digits is 225000, while the sum is 42.

The spelling of 21255355615011 in words is "twenty-one trillion, two hundred fifty-five billion, three hundred fifty-five million, six hundred fifteen thousand, eleven".