21244079356900 has 27 divisors (see below), whose sum is σ = 46099752222811. Its totient is φ = 8497613306240.

The previous prime is 21244079356847. The next prime is 21244079356901. The reversal of 21244079356900 is 965397044212.

The square root of 21244079356900 is 4609130.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 9251488723876 + 11992590633024 = 3041626^2 + 3463032^2 .

It is a super-2 number, since 2×21244079356900² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21244079356901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 45860844 + ... + 46321756.

Almost surely, 2^{21244079356900} is an apocalyptic number.

21244079356900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

21244079356900 is the 4609130-th square number.

It is an amenable number.

21244079356900 is an abundant number, since it is smaller than the sum of its proper divisors (24855672865911).

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

21244079356900 is an frugal number, since it uses more digits than its factorization.

21244079356900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921840 (or 460920 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 21244079356900 in words is "twenty-one trillion, two hundred forty-four billion, seventy-nine million, three hundred fifty-six thousand, nine hundred".