21301042666 has 32 divisors (see below), whose sum is σ = 33188658048. Its totient is φ = 10246210560.

The previous prime is 21301042627. The next prime is 21301042691. The reversal of 21301042666 is 66624010312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2246251 + ... + 2255713.

It is an arithmetic number, because the mean of its divisors is an integer number (1037145564).

Almost surely, 2^21301042666 is an apocalyptic number.

21301042666 is a deficient number, since it is larger than the sum of its proper divisors (11887615382).

21301042666 is a wasteful number, since it uses less digits than its factorization.

21301042666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9886.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 21301042666 its reverse (66624010312), we get a palindrome (87925052978).

The spelling of 21301042666 in words is "twenty-one billion, three hundred one million, forty-two thousand, six hundred sixty-six".