21422543660 has 24 divisors (see below), whose sum is σ = 51414105120. Its totient is φ = 7344872064.

The previous prime is 21422543651. The next prime is 21422543663. The reversal of 21422543660 is 6634522412.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 21422543660.

It is not an unprimeable number, because it can be changed into a prime (21422543663) 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, 76508945 + ... + 76509224.

It is an arithmetic number, because the mean of its divisors is an integer number (2142254380).

Almost surely, 2^21422543660 is an apocalyptic number.

21422543660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21422543660 is an abundant number, since it is smaller than the sum of its proper divisors (29991561460).

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

21422543660 is a wasteful number, since it uses less digits than its factorization.

21422543660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153018185 (or 153018183 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 21422543660 in words is "twenty-one billion, four hundred twenty-two million, five hundred forty-three thousand, six hundred sixty".