21224584668 has 24 divisors (see below), whose sum is σ = 56598892672. Its totient is φ = 6064167024.

The previous prime is 21224584649. The next prime is 21224584669. The reversal of 21224584668 is 86648542212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224584669) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 126336730 + ... + 126336897.

Almost surely, 2^21224584668 is an apocalyptic number.

21224584668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21224584668 is an abundant number, since it is smaller than the sum of its proper divisors (35374308004).

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

21224584668 is a wasteful number, since it uses less digits than its factorization.

21224584668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252673641 (or 252673639 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 48.

The spelling of 21224584668 in words is "twenty-one billion, two hundred twenty-four million, five hundred eighty-four thousand, six hundred sixty-eight".