21324220450 has 48 divisors (see below), whose sum is σ = 43106069160. Its totient is φ = 7801297920.

The previous prime is 21324220447. The next prime is 21324220451. The reversal of 21324220450 is 5402242312.

It can be written as a sum of positive squares in 12 ways, for example, as 3540131001 + 17784089449 = 59499^2 + 133357^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21324220451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79639 + ... + 221338.

Almost surely, 2^21324220450 is an apocalyptic number.

21324220450 is an abundant number, since it is smaller than the sum of its proper divisors (21781848710).

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

21324220450 is a wasteful number, since it uses less digits than its factorization.

21324220450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301111 (or 301106 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21324220450 its reverse (5402242312), we get a palindrome (26726462762).

The spelling of 21324220450 in words is "twenty-one billion, three hundred twenty-four million, two hundred twenty thousand, four hundred fifty".