21422543657 has 8 divisors (see below), whose sum is σ = 21808818432. Its totient is φ = 21038617600.

The previous prime is 21422543651. The next prime is 21422543663. The reversal of 21422543657 is 75634522412.

It is an interprime number because it is at equal distance from previous prime (21422543651) and next prime (21422543663).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21422543657 - 2¹⁰ = 21422542633 is a prime.

It is a super-3 number, since 3×21422543657³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21422543651) 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 7 ways as a sum of consecutive naturals, for example, 568769 + ... + 605262.

It is an arithmetic number, because the mean of its divisors is an integer number (2726102304).

Almost surely, 2^21422543657 is an apocalyptic number.

It is an amenable number.

21422543657 is a deficient number, since it is larger than the sum of its proper divisors (386274775).

21422543657 is a wasteful number, since it uses less digits than its factorization.

21422543657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174359.

The product of its digits is 403200, while the sum is 41.

The spelling of 21422543657 in words is "twenty-one billion, four hundred twenty-two million, five hundred forty-three thousand, six hundred fifty-seven".