21445124364 has 144 divisors (see below), whose sum is σ = 58723872480. Its totient is φ = 6577459200.

The previous prime is 21445124347. The next prime is 21445124377. The reversal of 21445124364 is 46342154412.

21445124364 is a `hidden beast` number, since 2 + 1 + 44 + 512 + 43 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 3658524 + ... + 3664380.

It is an arithmetic number, because the mean of its divisors is an integer number (407804670).

Almost surely, 2^21445124364 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21445124364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29361936240).

21445124364 is an abundant number, since it is smaller than the sum of its proper divisors (37278748116).

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

21445124364 is a wasteful number, since it uses less digits than its factorization.

21445124364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6040 (or 6035 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

Adding to 21445124364 its reverse (46342154412), we get a palindrome (67787278776).

The spelling of 21445124364 in words is "twenty-one billion, four hundred forty-five million, one hundred twenty-four thousand, three hundred sixty-four".