21233402866 has 32 divisors (see below), whose sum is σ = 36579150720. Its totient is φ = 9157176576.

The previous prime is 21233402857. The next prime is 21233402891. The reversal of 21233402866 is 66820433212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111366 + ... + 234241.

It is an arithmetic number, because the mean of its divisors is an integer number (1143098460).

Almost surely, 2^21233402866 is an apocalyptic number.

21233402866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21233402866 is a deficient number, since it is larger than the sum of its proper divisors (15345747854).

21233402866 is a wasteful number, since it uses less digits than its factorization.

21233402866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345778.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 21233402866 in words is "twenty-one billion, two hundred thirty-three million, four hundred two thousand, eight hundred sixty-six".