21660563124147 has 16 divisors (see below), whose sum is σ = 30401158608000. Its totient is φ = 13680189941184.

The previous prime is 21660563124127. The next prime is 21660563124173. The reversal of 21660563124147 is 74142136506612.

It is not a de Polignac number, because 21660563124147 - 2²³ = 21660554735539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21660563124096 and 21660563124105.

It is not an unprimeable number, because it can be changed into a prime (21660563124127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2533504 + ... + 7052642.

It is an arithmetic number, because the mean of its divisors is an integer number (1900072413000).

Almost surely, 2^{21660563124147} is an apocalyptic number.

21660563124147 is a deficient number, since it is larger than the sum of its proper divisors (8740595483853).

21660563124147 is a wasteful number, since it uses less digits than its factorization.

21660563124147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4603250.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 21660563124147 in words is "twenty-one trillion, six hundred sixty billion, five hundred sixty-three million, one hundred twenty-four thousand, one hundred forty-seven".