21041666683 has 16 divisors (see below), whose sum is σ = 22465779840. Its totient is φ = 19638596736.

The previous prime is 21041666651. The next prime is 21041666689. The reversal of 21041666683 is 38666614012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21041666683 - 2⁵ = 21041666651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21041666689) 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, 2233060 + ... + 2242462.

It is an arithmetic number, because the mean of its divisors is an integer number (1404111240).

Almost surely, 2^21041666683 is an apocalyptic number.

21041666683 is a deficient number, since it is larger than the sum of its proper divisors (1424113157).

21041666683 is a wasteful number, since it uses less digits than its factorization.

21041666683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506.

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 21041666683 in words is "twenty-one billion, forty-one million, six hundred sixty-six thousand, six hundred eighty-three".