21155334616466 has 32 divisors (see below), whose sum is σ = 32641866915840. Its totient is φ = 10278108810576.

The previous prime is 21155334616439. The next prime is 21155334616469. The reversal of 21155334616466 is 66461643355112.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21155334616469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12100715 + ... + 13738193.

It is an arithmetic number, because the mean of its divisors is an integer number (1020058341120).

Almost surely, 2^{21155334616466} is an apocalyptic number.

21155334616466 is a deficient number, since it is larger than the sum of its proper divisors (11486532299374).

21155334616466 is a wasteful number, since it uses less digits than its factorization.

21155334616466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638518.

The product of its digits is 9331200, while the sum is 53.

The spelling of 21155334616466 in words is "twenty-one trillion, one hundred fifty-five billion, three hundred thirty-four million, six hundred sixteen thousand, four hundred sixty-six".