21666035005004 has 24 divisors (see below), whose sum is σ = 40924314817680. Its totient is φ = 9977135747904.

The previous prime is 21666035004983. The next prime is 21666035005007. The reversal of 21666035005004 is 40050053066612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21666035005007) 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, 470241659 + ... + 470287730.

It is an arithmetic number, because the mean of its divisors is an integer number (1705179784070).

Almost surely, 2^{21666035005004} is an apocalyptic number.

It is an amenable number.

21666035005004 is a deficient number, since it is larger than the sum of its proper divisors (19258279812676).

21666035005004 is a wasteful number, since it uses less digits than its factorization.

21666035005004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940529849 (or 940529847 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 21666035005004 in words is "twenty-one trillion, six hundred sixty-six billion, thirty-five million, five thousand, four".