21154661150466 has 32 divisors (see below), whose sum is σ = 43769946902400. Its totient is φ = 6808134977280.

The previous prime is 21154661150351. The next prime is 21154661150489. The reversal of 21154661150466 is 66405116645112.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2228355 + ... + 6875673.

It is an arithmetic number, because the mean of its divisors is an integer number (1367810840700).

Almost surely, 2^{21154661150466} is an apocalyptic number.

21154661150466 is an abundant number, since it is smaller than the sum of its proper divisors (22615285751934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154661150466 is a wasteful number, since it uses less digits than its factorization.

21154661150466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4673514.

The product of its (nonzero) digits is 1036800, while the sum is 48.

Adding to 21154661150466 its reverse (66405116645112), we get a palindrome (87559777795578).

The spelling of 21154661150466 in words is "twenty-one trillion, one hundred fifty-four billion, six hundred sixty-one million, one hundred fifty thousand, four hundred sixty-six".