21660563124146 has 8 divisors (see below), whose sum is σ = 32491002818844. Its totient is φ = 10830228851200.

The previous prime is 21660563124127. The next prime is 21660563124173. The reversal of 21660563124146 is 64142136506612.

It can be written as a sum of positive squares in 2 ways, for example, as 20807875249225 + 852687874921 = 4561565^2 + 923411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21660563124146² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21660563124146.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25839755 + ... + 26664846.

Almost surely, 2^{21660563124146} is an apocalyptic number.

21660563124146 is a deficient number, since it is larger than the sum of its proper divisors (10830439694698).

21660563124146 is a wasteful number, since it uses less digits than its factorization.

21660563124146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52710876.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 21660563124146 in words is "twenty-one trillion, six hundred sixty billion, five hundred sixty-three million, one hundred twenty-four thousand, one hundred forty-six".