21666152345144 has 32 divisors (see below), whose sum is σ = 40672116357600. Its totient is φ = 10820257344000.

The previous prime is 21666152345137. The next prime is 21666152345171. The reversal of 21666152345144 is 44154325166612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21666152345092 and 21666152345101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66093644 + ... + 66420644.

It is an arithmetic number, because the mean of its divisors is an integer number (1271003636175).

Almost surely, 2^{21666152345144} is an apocalyptic number.

It is an amenable number.

21666152345144 is a deficient number, since it is larger than the sum of its proper divisors (19005964012456).

21666152345144 is a wasteful number, since it uses less digits than its factorization.

21666152345144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336783 (or 336779 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 50.

The spelling of 21666152345144 in words is "twenty-one trillion, six hundred sixty-six billion, one hundred fifty-two million, three hundred forty-five thousand, one hundred forty-four".