21442168550 has 48 divisors (see below), whose sum is σ = 43522808112. Its totient is φ = 7794518400.

The previous prime is 21442168549. The next prime is 21442168613. The reversal of 21442168550 is 5586124412.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 2466812 + ... + 2475488.

It is an arithmetic number, because the mean of its divisors is an integer number (906725169).

Almost surely, 2^21442168550 is an apocalyptic number.

21442168550 is an abundant number, since it is smaller than the sum of its proper divisors (22080639562).

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

21442168550 is a wasteful number, since it uses less digits than its factorization.

21442168550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13193 (or 13188 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 38.

The spelling of 21442168550 in words is "twenty-one billion, four hundred forty-two million, one hundred sixty-eight thousand, five hundred fifty".