21668603001 has 8 divisors (see below), whose sum is σ = 28893864480. Its totient is φ = 14444538432.

The previous prime is 21668602999. The next prime is 21668603039. The reversal of 21668603001 is 10030686612.

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

It is not a de Polignac number, because 21668603001 - 2¹ = 21668602999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21668603041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256096 + ... + 330033.

It is an arithmetic number, because the mean of its divisors is an integer number (3611733060).

Almost surely, 2^21668603001 is an apocalyptic number.

It is an amenable number.

21668603001 is a deficient number, since it is larger than the sum of its proper divisors (7225261479).

21668603001 is a wasteful number, since it uses less digits than its factorization.

21668603001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598455.

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 21668603001 in words is "twenty-one billion, six hundred sixty-eight million, six hundred three thousand, one".