21255872281211 has 8 divisors (see below), whose sum is σ = 21346823678400. Its totient is φ = 21164943634560.

The previous prime is 21255872281207. The next prime is 21255872281229. The reversal of 21255872281211 is 11218227855212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21255872281211 - 2² = 21255872281207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21255872281271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3813716 + ... + 7553553.

It is an arithmetic number, because the mean of its divisors is an integer number (2668352959800).

Almost surely, 2^{21255872281211} is an apocalyptic number.

21255872281211 is a deficient number, since it is larger than the sum of its proper divisors (90951397189).

21255872281211 is a wasteful number, since it uses less digits than its factorization.

21255872281211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11375269.

The product of its digits is 358400, while the sum is 47.

The spelling of 21255872281211 in words is "twenty-one trillion, two hundred fifty-five billion, eight hundred seventy-two million, two hundred eighty-one thousand, two hundred eleven".