21837405857 has 16 divisors (see below), whose sum is σ = 23134425600. Its totient is φ = 20584005120.

The previous prime is 21837405833. The next prime is 21837405859. The reversal of 21837405857 is 75850473812.

It is a cyclic number.

It is not a de Polignac number, because 21837405857 - 2¹⁴ = 21837389473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21837405859) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 144593 + ... + 254129.

It is an arithmetic number, because the mean of its divisors is an integer number (1445901600).

Almost surely, 2^21837405857 is an apocalyptic number.

It is an amenable number.

21837405857 is a deficient number, since it is larger than the sum of its proper divisors (1297019743).

21837405857 is a wasteful number, since it uses less digits than its factorization.

21837405857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109736.

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 21837405857 in words is "twenty-one billion, eight hundred thirty-seven million, four hundred five thousand, eight hundred fifty-seven".