21366502441604 has 6 divisors (see below), whose sum is σ = 37391379272814. Its totient is φ = 10683251220800.

The previous prime is 21366502441573. The next prime is 21366502441643. The reversal of 21366502441604 is 40614420566312.

It can be written as a sum of positive squares in only one way, i.e., 20426766081604 + 939736360000 = 4519598^2 + 969400^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2670812805197 + ... + 2670812805204.

It is an arithmetic number, because the mean of its divisors is an integer number (6231896545469).

Almost surely, 2^{21366502441604} is an apocalyptic number.

It is an amenable number.

21366502441604 is a deficient number, since it is larger than the sum of its proper divisors (16024876831210).

21366502441604 is a wasteful number, since it uses less digits than its factorization.

21366502441604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5341625610405 (or 5341625610403 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 21366502441604 in words is "twenty-one trillion, three hundred sixty-six billion, five hundred two million, four hundred forty-one thousand, six hundred four".