21143201660215 has 16 divisors (see below), whose sum is σ = 25722517739328. Its totient is φ = 16680833646336.

The previous prime is 21143201660197. The next prime is 21143201660297. The reversal of 21143201660215 is 51206610234112.

It is a cyclic number.

It is not a de Polignac number, because 21143201660215 - 2⁹ = 21143201659703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489184 + ... + 6521173.

It is an arithmetic number, because the mean of its divisors is an integer number (1607657358708).

Almost surely, 2^{21143201660215} is an apocalyptic number.

21143201660215 is a deficient number, since it is larger than the sum of its proper divisors (4579316079113).

21143201660215 is an equidigital number, since it uses as much as digits as its factorization.

21143201660215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7018698.

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 21143201660215 its reverse (51206610234112), we get a palindrome (72349811894327).

The spelling of 21143201660215 in words is "twenty-one trillion, one hundred forty-three billion, two hundred one million, six hundred sixty thousand, two hundred fifteen".