21222724600 has 96 divisors (see below), whose sum is σ = 61518384000. Its totient is φ = 6614870400.

The previous prime is 21222724597. The next prime is 21222724609. The reversal of 21222724600 is 642722212.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222724609) 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 23 ways as a sum of consecutive naturals, for example, 673650 + ... + 704449.

It is an arithmetic number, because the mean of its divisors is an integer number (640816500).

Almost surely, 2^21222724600 is an apocalyptic number.

21222724600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222724600 is an abundant number, since it is smaller than the sum of its proper divisors (40295659400).

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

21222724600 is a wasteful number, since it uses less digits than its factorization.

21222724600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378133 (or 1378124 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The spelling of 21222724600 in words is "twenty-one billion, two hundred twenty-two million, seven hundred twenty-four thousand, six hundred".