21006748466 has 16 divisors (see below), whose sum is σ = 34390841760. Its totient is φ = 9544032480.

The previous prime is 21006748429. The next prime is 21006748489. The reversal of 21006748466 is 66484760012.

It is a super-2 number, since 2×21006748466² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176396 + ... + 270423.

It is an arithmetic number, because the mean of its divisors is an integer number (2149427610).

Almost surely, 2^21006748466 is an apocalyptic number.

21006748466 is a deficient number, since it is larger than the sum of its proper divisors (13384093294).

21006748466 is a wasteful number, since it uses less digits than its factorization.

21006748466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448969.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 21006748466 in words is "twenty-one billion, six million, seven hundred forty-eight thousand, four hundred sixty-six".