21087148366 has 16 divisors (see below), whose sum is σ = 33303225600. Its totient is φ = 9986330808.

The previous prime is 21087148343. The next prime is 21087148399. The reversal of 21087148366 is 66384178012.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 107425 + ... + 231763.

It is an arithmetic number, because the mean of its divisors is an integer number (2081451600).

Almost surely, 2^21087148366 is an apocalyptic number.

21087148366 is a deficient number, since it is larger than the sum of its proper divisors (12216077234).

21087148366 is a wasteful number, since it uses less digits than its factorization.

21087148366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128823.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 21087148366 in words is "twenty-one billion, eighty-seven million, one hundred forty-eight thousand, three hundred sixty-six".