21666078532241 has 64 divisors (see below), whose sum is σ = 26343028002816. Its totient is φ = 17557659187200.

The previous prime is 21666078532223. The next prime is 21666078532283. The reversal of 21666078532241 is 14223587066612.

It is not a de Polignac number, because 21666078532241 - 2³⁰ = 21665004790417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21666078532291) 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, 215740946 + ... + 215841348.

It is an arithmetic number, because the mean of its divisors is an integer number (411609812544).

Almost surely, 2^{21666078532241} is an apocalyptic number.

It is an amenable number.

21666078532241 is a deficient number, since it is larger than the sum of its proper divisors (4676949470575).

21666078532241 is a wasteful number, since it uses less digits than its factorization.

21666078532241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100902.

The product of its (nonzero) digits is 5806080, while the sum is 53.

The spelling of 21666078532241 in words is "twenty-one trillion, six hundred sixty-six billion, seventy-eight million, five hundred thirty-two thousand, two hundred forty-one".