21454555012211 has 4 divisors (see below), whose sum is σ = 21455012971152. Its totient is φ = 21454097053272.

The previous prime is 21454555012207. The next prime is 21454555012259. The reversal of 21454555012211 is 11221055545412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21454555012211 - 2² = 21454555012207 is a prime.

It is a super-3 number, since 3×21454555012211³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454555012201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228909191 + ... + 229002896.

It is an arithmetic number, because the mean of its divisors is an integer number (5363753242788).

Almost surely, 2^{21454555012211} is an apocalyptic number.

21454555012211 is a deficient number, since it is larger than the sum of its proper divisors (457958941).

21454555012211 is an equidigital number, since it uses as much as digits as its factorization.

21454555012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457958940.

The product of its (nonzero) digits is 80000, while the sum is 38.

The spelling of 21454555012211 in words is "twenty-one trillion, four hundred fifty-four billion, five hundred fifty-five million, twelve thousand, two hundred eleven".