21549059596 has 12 divisors (see below), whose sum is σ = 37761614352. Its totient is φ = 10760026928.

The previous prime is 21549059573. The next prime is 21549059599. The reversal of 21549059596 is 69595094512.

It is not an unprimeable number, because it can be changed into a prime (21549059599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3622375 + ... + 3628318.

It is an arithmetic number, because the mean of its divisors is an integer number (3146801196).

Almost surely, 2^21549059596 is an apocalyptic number.

It is an amenable number.

21549059596 is a deficient number, since it is larger than the sum of its proper divisors (16212554756).

21549059596 is a wasteful number, since it uses less digits than its factorization.

21549059596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7251440 (or 7251438 counting only the distinct ones).

The product of its (nonzero) digits is 4374000, while the sum is 55.

The spelling of 21549059596 in words is "twenty-one billion, five hundred forty-nine million, fifty-nine thousand, five hundred ninety-six".