21126603466 has 16 divisors (see below), whose sum is σ = 31811921856. Its totient is φ = 10522685376.

The previous prime is 21126603457. The next prime is 21126603469. The reversal of 21126603466 is 66430662112.

It is not an unprimeable number, because it can be changed into a prime (21126603469) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 786835 + ... + 813241.

It is an arithmetic number, because the mean of its divisors is an integer number (1988245116).

Almost surely, 2^21126603466 is an apocalyptic number.

21126603466 is a deficient number, since it is larger than the sum of its proper divisors (10685318390).

21126603466 is a wasteful number, since it uses less digits than its factorization.

21126603466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27933.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 21126603466 in words is "twenty-one billion, one hundred twenty-six million, six hundred three thousand, four hundred sixty-six".